Sandu Ursu's questions -ubuntu

Sandu Ursu

Asked: 2021-01-27 20:42:09 +0800 CST

System not booting with no free disk space

0

I have used PhotoRec/TestDisk on my laptop with Ubuntu 18.04.5 to recover some deleted files from the ext4 filesystem.

I first let it do its work on the entire partition, all extensions. And PhotoRec has managed to recover a couple of millions of files. Since the recovered files are named differently and are not arranged in folders as they were it is hard to find the files of interest. I then launched PhotoRec again with only one file type: sqlite, but I asked it to search for corrupted files as well.

It run well for a while, but then it notified me that I am running low on memory and suggested me to empty my trash bin. I did delete the files in my trash and resumed the search.

Soon the system completely run out of memory to the point where it was not possible to create a new folder.

I have deleted the initially recovered files (all from the entire partition). But it didn't seem to delete them actually. To be precise: the files disappeared. But, the space was not freed.

I thought a reboot will free the space. But, now I can't even boot into Ubuntu:

I can go to Advanced Options >> Ubuntu (recovery mode).

I have a number of options there. One of them: system-summary, tells me that, indeed, my disk is 100% full.

Now, my instinct is to run clean. But, as the saying goes: once bitten, twice shy - I'm not quite sure this is the right thing to do. It says "Continuing will remount your / filesystem in read/write mode and mount any other filesystem defined in /etc/fstab".

What is the right thing to do here?
What is in /etc/fstab?
Can I free only part of my space, enough to be able to boot the system and still keep my recovered files.

It looks like the recovered files which I have Shift+Delete-ed are still stored in .local/share/Trash/expunged. Why are they still here?

Sandu Ursu

Asked: 2021-01-26 11:18:11 +0800 CST

Restore Session Buddy files from deleted `.config/google-chrome`

0

I use the Sessions Buddy Chrome extension to compartmentalize interesting links to different domains of interest.

Today, I've got a notification from Chrome saying that I should reinstall it (the automatic update failed). I did reinstall Chrome in the past, after backing up my Session Buddy data, and was happy to see that reinstalling Chrome actually saved my sessions data. So, I thought, I need not worry now. I've re-installed Chrome and everything went fine. Sessions were there. Except that it still told me that my Chrome version is old.

I've purged Chrome from my computer, removed ~/.configs/google-chrome. Then reinstalled again. Synced with my google account. Now my Chrome is updated, but, of course, all my Session Buddy data is gone. On top of that, another google-chrome folder has been created.

In a desperate hope to restore this data, I have installed PhotoRecand it has revealed hundreds of thousands of files.

How can I identify which data belongs to Session Buddy?
Has anyone managed to restore the data this way?
Is there any other way to restore my sessions?

Ubuntu 18.04.5

Sandu Ursu

Asked: 2020-08-15 02:22:54 +0800 CST

Wake On LAN issues

1

I have an old Toshiba laptop connected to the router via an Ethernet cable. I have installed Ubuntu 18.04 in dual-boot with Windows 10 on it and I am trying to set up Wake On Lan (WOL).

My steps:

Enable WOL in BIOS
Run sudo ethtool -s enp1s0 wol g. Check that the letter has changed from d to g with sudo ethtool -s enp1s0
Put the laptop in sleep mode: sudo systemctl suspend
Install wakeonlan. Run wakeonlan <MAC Address> from another laptop on the same network.

My other laptop sends the magic packet, but does not wake up the Toshiba laptop. I have also tried 2 Android apps: Wake On Lan and WolOn - Wake on LAN. Still, the laptop does not wake up. What could be the reason?

If I manually wake up the Toshiba by opening the lid and check:

sudo ethtool -s enp1s0

the letter is back to d:

...
    Supports Wake-on: pumbg
    Wake-on: d
...

What does pumbg mean?

Edit: pumbg seems to indicate the supported WOL modes. They can be seen with man ethtool:

wol p|u|m|b|a|g|s|d...
                  Sets Wake-on-LAN options.  Not  all  devices  support  this.
                  The argument to this option is a string of characters speci‐
                  fying which options to enable.

                  p   Wake on PHY activity
                  u   Wake on unicast messages
                  m   Wake on multicast messages
                  b   Wake on broadcast messages
                  a   Wake on ARP
                  g   Wake on MagicPacket™
                  s   Enable SecureOn™ password for MagicPacket™
                  d   Disable (wake on  nothing).   This  option
                      clears all previous options.

I am able to WOL the laptop in Windows.

Regarding Wake On Wireless LAN, when I run:

sudo ethtool wlp2s0

I get:

Settings for wlp2s0:
    Link detected: yes

Do I understand it right from this output that my WiFi card does not support WOL?

Sandu Ursu

Asked: 2020-07-18 04:13:20 +0800 CST

SSH - UsePAM yes or no?

15

After setting up SSH key-based authentication, people are advised to disable SSH password authentication.

This is done by navigating to /etc/ssh/sshd_config and making sure that the following line is not commented out:

PasswordAuthentication no

Some tutorials, e.g.

How to Set Up SSH Keys on Ubuntu 18.04

recommend also setting

UsePAM no

After doing that, I have noticed that I no longer get session notifications from the host. For example when I want to shutdown/reboot it, the terminal hangs and I no longer get:

Connection to 192.168.0.3 closed by remote host.
Connection to 192.168.0.3 closed.

I have read here that one should "probably want to keep it on". Furthermore it may actually help you get safer.

Questions:

How precisely does UsePAM no contribute to security?
Can I somehow still get the session status if I disable UsePAM?

Sandu Ursu

Asked: 2020-06-21 11:07:43 +0800 CST

`nvidia-xconfig` breaks boot

3

I would like to test some GPU overclocking add fan speed settings on my machine.

For that I need to enable the Coolbits option in the Device section (Enabling overclocking):

sudo nvidia-xconfig --cool-bits=12

It seems that this line above will create a xorg.conf file, but the Coolbits option does is not written under Device, but under Screen configurations.

Even so, if I only create the xorg.conf file with sudo nvidia-xconfig, and then manually add Option "Coolbits" "12" in the "Device" Section to make it look like this:

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    Option         "Coolbits" "12"
EndSection

when I restart the machine, Ubuntu 18.04.4 does not get past the loading screen: Ubuntu 18.04 hangs at boot after running `nvidia-xconfig`

Others encountered the same problem:

I couldn't find a clear solution. How can I make the nvidia-xconfig work properly?

Sandu Ursu

Asked: 2020-06-20 18:25:11 +0800 CST

Ubuntu 18.04 hangs at boot after running `nvidia-xconfig`

1

Ubuntu 18.04.4 stuck at the loading screen after running the following command and rebooting:

sudo nvidia-xconfig

I forcefully shut it down a couple of times and when I started it again it still hangs there.

I'm standing here looking at the screen and I can't believe that NVIDIA is a 230 bln $ company.

What solutions are there? Is there any way I could access the terminal from here in order to delete the xorg.conf file?

If I press ctrl+alt+F4, it takes me to a screen which says:

xHCI host controller not responding, assume dead
A start job is running for Hold until boot process finishers up

Sandu Ursu

Asked: 2020-06-20 15:13:22 +0800 CST

Apply powertop settings

0

On the powertop page of archlinux wiki it says:

There are two ways to automatically apply the suggested settings:

Recommended: You can apply these settings at boot by using module parameters, udev rules and sysctl. For details, see the power management page.

You can use the --auto-tune feature from powertop which sets all tunable options to their GOOD setting. This can be combined with systemd service to have the tunables set on boot. Remember to enable/start the service.

Currently I use the second method.

I have 3 questions:

Will the results be identical?
Why is the first way the recommended one?
How exactly to implement the first method?

Also, a comment on this post post says:

No need to install powertop, just install and run TLP. Feel free to check the variables in powertop afterwards, they'll already be activated by TLP. :-)

If I already use tlp does it mean that it applies the powertop sugegsted settings by itself? Or, to ask differently: do I need powertop if I use tlp?

On the TLP webpage there is a note:

On the other hand, attempting to run powertop --auto-tune on each boot may overwrite TLP’s settings depending on the actual boot order.

Is it a bad idea to apply powertop settings at boot?

Sandu Ursu

Asked: 2020-06-20 05:49:32 +0800 CST

Overclock NVIDIA GPU to achieve undervolting

4

While undervolting a CPU is straightforward, undervolting the dGPU is a bit trickier.

You can't directly undervolt the dGPU, but what you can do is overclock the frequency which results in any given frequency running at a lower voltage, thus effectively undervolting.

I have read first about this in this comment. u/Jr712 then provided more details in a post How I stopped my XPS 15 7590 GPU from throttling.

As described in the post, on Windows this can be done with MSI Afterburner. I would like to ask those of you who are more knowledgeable for instructions how can this be done on Linux.

I have read about this in some places, but as I have never done this before, I am not certain I will get what I want.

Here are some sources I have looked at:

How to overclock Nvidia graphics cards on Linux
In the video, there is actually a slide bar where I could undervolt directly. Should I instead do that? (Although in the comments someone says that "Nvidia is not allowing voltage control on Linux for new gen cards")
How can I overclock a graphics card from within Ubuntu?

I know that overclocking is controlled via Coolbits

And as pointed out in Enabling overclocking:

The Coolbits option can be easily controlled with the nvidia-xconfig, which manipulates the Xorg configuration files:

nvidia-xconfig --cool-bits=*value*

But the above links set different levels: 12 vs. 28.

Also, I'd like to learn more about:

What are the risks? Especially for CUDA usage (e.g. wrong calculations)?

I can read in Enabling overclocking:

Warning: Overclocking might permanently damage your hardware. You have been warned.

This leads me to the next question:
What is the "safe" range for overclocking?
If I overclock the dGPU, should I offset also the mem clock? By how much?

Sandu Ursu

Asked: 2019-06-27 18:07:05 +0800 CST

The effects of switching between graphics cards

1

I have a Dell XPS 15 9570 with Ubuntu 18.04 on it and the following graphics cards:

Intel® UHD Graphics 630 (Coffeelake 3x8 GT2)
NVIDIA® GeForce® GTX 1050Ti 4GB GDDR5

The first is integrated, and the latter is dedicated. Integrated means that it uses the CPU and System RAM for graphics processing.

I know how to force switching between these cards, e.g. to select the Intel GPU:

sudo prime-select intel

I am trying to understand how Ubuntu makes use of the cards available.

More precisely:

Is there a default GPU? If so, how can I check which one is the default one? How can I check which one is being used?
What does it mean to prime-select a graphics card? Does it mean that it will always force the GPU computations to be done on the selected graphics card?
An answer here says that Ubuntu does not switch between the cards to balance power/performance. Does this mean that the same task (e.g. running a game) cannot be done on both GPUs at the same time, and there cannot be any switching between cards during the processing of the same task, but for different tasks Ubuntu may decide to run them on different GPUs? Or does that mean that the System will always use only one card (the default or prime-selected one)?

Thank you!

Sandu Ursu

Asked: 2018-10-13 15:11:06 +0800 CST

Headphones work only when unplugged and plugged in again

2

I have a Dell XPS 15 9570 with Ubuntu 18.04.

When I plug in my headphones I can listen to audio. Everything works fine. Except from the shrill noise I get when I don't play any audio.

Another issue is that, if I leave the headphones plugged in and reboot the laptop, it appears that the headphones don't work, i.e. I cannot listen to any audio. To be able to hear anything I have to unplug and plug in the headphones again.

How to fix these issues?

UPDATE

When I run journalctl --follow and plug in the headphones I get:

Oct 14 18:31:24 xps systemd[1444]: Starting GNOME Terminal Server...
Oct 14 18:31:25 xps dbus-daemon[1718]: [session uid=1000 pid=1718] Successfully activated service 'org.gnome.Terminal'
Oct 14 18:31:25 xps systemd[1444]: Started GNOME Terminal Server.
Oct 14 18:31:55 xps wpa_supplicant[914]: wlp59s0: CTRL-EVENT-SIGNAL-CHANGE above=1 signal=-74 noise=-101 txrate=6000
Oct 14 18:31:57 xps wpa_supplicant[914]: wlp59s0: CTRL-EVENT-SIGNAL-CHANGE above=0 signal=-82 noise=-101 txrate=6000

I then leave the headphones in and reboot. After I run journalctl -b I get:

Oct 13 14:46:31 xps kernel: Linux version 4.15.0-36-generic (buildd@lgw01-amd64-031) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018 (Ubuntu 4.15.0-36.39-generic 4.15.18)
Oct 13 14:46:31 xps kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-36-generic root=UUID=c02749bd-9e22-473e-8668-62d1fc153ee0 ro quiet splash vt.handoff=1
Oct 13 14:46:31 xps kernel: KERNEL supported cpus:
Oct 13 14:46:31 xps kernel:   Intel GenuineIntel
Oct 13 14:46:31 xps kernel:   AMD AuthenticAMD
Oct 13 14:46:31 xps kernel:   Centaur CentaurHauls
Oct 13 14:46:31 xps kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
Oct 13 14:46:31 xps kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
Oct 13 14:46:31 xps kernel: x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
Oct 13 14:46:31 xps kernel: x86/fpu: Supporting XSAVE feature 0x008: 'MPX bounds registers'
Oct 13 14:46:31 xps kernel: x86/fpu: Supporting XSAVE feature 0x010: 'MPX CSR'
Oct 13 14:46:31 xps kernel: x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
Oct 13 14:46:31 xps kernel: x86/fpu: xstate_offset[3]:  832, xstate_sizes[3]:   64
Oct 13 14:46:31 xps kernel: x86/fpu: xstate_offset[4]:  896, xstate_sizes[4]:   64
Oct 13 14:46:31 xps kernel: x86/fpu: Enabled xstate features 0x1f, context size is 960 bytes, using 'compacted' format.
Oct 13 14:46:31 xps kernel: e820: BIOS-provided physical RAM map:
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009dfff] usable
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000000009e000-0x000000000009efff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] usable
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000000a0000-0x00000000000fffff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000650ddfff] usable
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000650de000-0x00000000650defff] ACPI NVS
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000650df000-0x00000000650dffff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000650e0000-0x000000006c606fff] usable
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000006c607000-0x000000006f408fff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000006f409000-0x000000006f485fff] ACPI data
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000006f486000-0x000000006f5b4fff] ACPI NVS
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000006f5b5000-0x000000006ff34fff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000006ff35000-0x000000006fffefff] type 20
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x000000006ffff000-0x000000006fffffff] usable
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x0000000070000000-0x0000000077ffffff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x0000000078000000-0x0000000078dfffff] usable
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x0000000078e00000-0x000000007f7fffff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000fe000000-0x00000000fe010fff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
Oct 13 14:46:31 xps kernel: BIOS-e820: [mem 0x0000000100000000-0x000000087c7fffff] usable
Oct 13 14:46:31 xps kernel: NX (Execute Disable) protection: active
Oct 13 14:46:31 xps kernel: efi: EFI v2.70 by American Megatrends
Oct 13 14:46:31 xps kernel: efi:  ACPI 2.0=0x6f422000  ACPI=0x6f422000  SMBIOS=0xf0000  SMBIOS 3.0=0xf0020  ESRT=0x6fc4a118  MEMATTR=0x6a414018 
Oct 13 14:46:31 xps kernel: secureboot: Secure boot could not be determined (mode 0)
Oct 13 14:46:31 xps kernel: SMBIOS 3.1.1 present.
Oct 13 14:46:31 xps kernel: DMI: Dell Inc. XPS 15 9570/07GHH0, BIOS 1.5.0 09/03/2018
Oct 13 14:46:31 xps kernel: e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
Oct 13 14:46:31 xps kernel: e820: remove [mem 0x000a0000-0x000fffff] usable
Oct 13 14:46:31 xps kernel: e820: last_pfn = 0x87c800 max_arch_pfn = 0x400000000
Oct 13 14:46:31 xps kernel: MTRR default type: write-back
Oct 13 14:46:31 xps kernel: MTRR fixed ranges enabled:
Oct 13 14:46:31 xps kernel:   00000-9FFFF write-back
Oct 13 14:46:31 xps kernel:   A0000-BFFFF uncachable
Oct 13 14:46:31 xps kernel:   C0000-FFFFF write-protect
Oct 13 14:46:31 xps kernel: MTRR variable ranges enabled:
Oct 13 14:46:31 xps kernel:   0 base 0080000000 mask 7F80000000 uncachable

The output from suo lsof ... is:

    Output information may be incomplete.
COMMAND    PID             USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
systemd      1             root    0u   CHR    1,3      0t0    6 /dev/null
systemd      1             root    1u   CHR    1,3      0t0    6 /dev/null
systemd      1             root    2u   CHR    1,3      0t0    6 /dev/null
systemd      1             root    3w   CHR   1,11      0t0   12 /dev/kmsg
systemd      1             root   23u   CHR  13,67      0t0  152 /dev/input/event3
systemd      1             root   25r   CHR 10,235      0t0  393 /dev/autofs
systemd      1             root  107u   CHR  226,0      0t0  223 /dev/dri/card0
systemd      1             root  109u   CHR  226,0      0t0  223 /dev/dri/card0
systemd      1             root  110u   CHR  13,69      0t0  288 /dev/input/event5
systemd      1             root  111u   CHR  13,70      0t0  290 /dev/input/event6
systemd      1             root  112u   CHR  13,65      0t0  150 /dev/input/event1
systemd      1             root  113u   CHR  13,66      0t0  151 /dev/input/event2
systemd      1             root  114u   CHR  13,78      0t0  513 /dev/input/event14
systemd      1             root  115u   CHR  13,75      0t0  466 /dev/input/event11
systemd      1             root  116u   CHR  13,76      0t0  468 /dev/input/event12
systemd      1             root  117u   CHR  13,77      0t0  477 /dev/input/event13
systemd      1             root  118u   CHR  13,73      0t0  437 /dev/input/event9
systemd      1             root  119u   CHR  13,72      0t0  436 /dev/input/event8
systemd      1             root  120u   CHR  13,74      0t0  458 /dev/input/event10
systemd      1             root  121u   CHR  13,68      0t0  155 /dev/input/event4
systemd      1             root  122u   CHR  13,71      0t0  432 /dev/input/event7
kdevtmpfs   79             root  cwd    DIR    0,6     4460    2 /dev
kdevtmpfs   79             root  rtd    DIR    0,6     4460    2 /dev
systemd-j  321             root    0r   CHR    1,3      0t0    6 /dev/null
systemd-j  321             root    1w   CHR    1,3      0t0    6 /dev/null
systemd-j  321             root    2w   CHR    1,3      0t0    6 /dev/null
systemd-j  321             root    7w   CHR   1,11      0t0   12 /dev/kmsg
systemd-j  321             root    9u   CHR   1,11      0t0   12 /dev/kmsg
systemd-u  341             root    0r   CHR    1,3      0t0    6 /dev/null
systemd-r  624  systemd-resolve    0r   CHR    1,3      0t0    6 /dev/null
systemd-t  625 systemd-timesync    0r   CHR    1,3      0t0    6 /dev/null
cupsd      878             root    0r   CHR    1,3      0t0    6 /dev/null
rsyslogd   879           syslog    0r   CHR    1,3      0t0    6 /dev/null
rsyslogd   879           syslog    1w   CHR    1,3      0t0    6 /dev/null
rsyslogd   879           syslog    2w   CHR    1,3      0t0    6 /dev/null
rsyslogd   879           syslog    4r   CHR    1,9      0t0   11 /dev/urandom
thermald   882             root    0r   CHR    1,3      0t0    6 /dev/null
dbus-daem  884       messagebus    0u   CHR    1,3      0t0    6 /dev/null
NetworkMa  910             root    0r   CHR    1,3      0t0    6 /dev/null
accounts-  911             root    0r   CHR    1,3      0t0    6 /dev/null
avahi-dae  913            avahi    0r   CHR    1,3      0t0    6 /dev/null
wpa_suppl  914             root    0r   CHR    1,3      0t0    6 /dev/null
wpa_suppl  914             root   11r   CHR  10,62      0t0    4 /dev/rfkill
wpa_suppl  914             root   17r   CHR  10,62      0t0    4 /dev/rfkill
acpid      918             root    1u   CHR    1,3      0t0    6 /dev/null
acpid      918             root    2u   CHR    1,3      0t0    6 /dev/null
acpid      918             root    4r   CHR  13,64      0t0  149 /dev/input/event0
acpid      918             root    5r   CHR  13,65      0t0  150 /dev/input/event1
acpid      918             root    6r   CHR  13,74      0t0  458 /dev/input/event10
acpid      918             root    7r   CHR  13,79      0t0  538 /dev/input/event15
acpid      918             root    8r   CHR  13,80      0t0  539 /dev/input/event16
acpid      918             root    9r   CHR  13,81      0t0  540 /dev/input/event17
acpid      918             root   10r   CHR  13,82      0t0  541 /dev/input/event18
acpid      918             root   11r   CHR  13,83      0t0  543 /dev/input/event19
acpid      918             root   12r   CHR  13,66      0t0  151 /dev/input/event2
acpid      918             root   13r   CHR  13,84      0t0  544 /dev/input/event20
acpid      918             root   14r   CHR  13,67      0t0  152 /dev/input/event3
acpid      918             root   15r   CHR  13,68      0t0  155 /dev/input/event4
acpid      918             root   16r   CHR  13,69      0t0  288 /dev/input/event5
acpid      918             root   17r   CHR  13,70      0t0  290 /dev/input/event6
acpid      918             root   18r   CHR  13,72      0t0  436 /dev/input/event8
acpid      918             root   19r   CHR  13,73      0t0  437 /dev/input/event9
ModemMana  919             root    0r   CHR    1,3      0t0    6 /dev/null
ModemMana  919             root    2w   CHR    1,3      0t0    6 /dev/null
cron       920             root    0r   CHR    1,3      0t0    6 /dev/null
networkd-  921             root    0r   CHR    1,3      0t0    6 /dev/null
udisksd    922             root    0r   CHR    1,3      0t0    6 /dev/null
avahi-dae  923            avahi    0r   CHR    1,3      0t0    6 /dev/null
systemd-l  925             root    0r   CHR    1,3      0t0    6 /dev/null
systemd-l  925             root   14u   CHR  13,67      0t0  152 /dev/input/event3
systemd-l  925             root   15u   CHR  13,65      0t0  150 /dev/input/event1
systemd-l  925             root   16u   CHR  13,64      0t0  149 /dev/input/event0
systemd-l  925             root   17u   CHR  13,66      0t0  151 /dev/input/event2
systemd-l  925             root   18u   CHR  13,73      0t0  437 /dev/input/event9
systemd-l  925             root   19u   CHR  13,72      0t0  436 /dev/input/event8
systemd-l  925             root   20u   CHR  13,68      0t0  155 /dev/input/event4
systemd-l  925             root   21u   CHR    4,6      0t0   25 /dev/tty6
systemd-l  925             root   24u   CHR    4,1      0t0   20 /dev/tty1
systemd-l  925             root   26u   CHR  226,0      0t0  223 /dev/dri/card0
systemd-l  925             root   27u   CHR    4,2      0t0   21 /dev/tty2
systemd-l  925             root   28u   CHR  13,67      0t0  152 /dev/input/event3
systemd-l  925             root   29u   CHR  13,69      0t0  288 /dev/input/event5
systemd-l  925             root   30u   CHR  13,70      0t0  290 /dev/input/event6
systemd-l  925             root   31u   CHR  13,65      0t0  150 /dev/input/event1
systemd-l  925             root   32u   CHR  13,66      0t0  151 /dev/input/event2
systemd-l  925             root   33u   CHR  13,78      0t0  513 /dev/input/event14
systemd-l  925             root   34u   CHR  13,75      0t0  466 /dev/input/event11
systemd-l  925             root   35u   CHR  13,76      0t0  468 /dev/input/event12
systemd-l  925             root   36u   CHR  13,77      0t0  477 /dev/input/event13
systemd-l  925             root   37u   CHR  13,73      0t0  437 /dev/input/event9
systemd-l  925             root   38u   CHR  13,72      0t0  436 /dev/input/event8
systemd-l  925             root   39u   CHR  13,74      0t0  458 /dev/input/event10
systemd-l  925             root   40u   CHR  13,68      0t0  155 /dev/input/event4
systemd-l  925             root   41u   CHR  13,71      0t0  432 /dev/input/event7
systemd-l  925             root   54u   CHR  226,0      0t0  223 /dev/dri/card0
irqbalanc  927             root    0r   CHR    1,3      0t0    6 /dev/null
bluetooth  931             root    0r   CHR    1,3      0t0    6 /dev/null
bluetooth  931             root   12u   CHR  10,62      0t0    4 /dev/rfkill
snapd      935             root    0r   CHR    1,3      0t0    6 /dev/null
polkitd    972             root    0u   CHR    1,3      0t0    6 /dev/null
polkitd    972             root    1u   CHR    1,3      0t0    6 /dev/null
polkitd    972             root    2u   CHR    1,3      0t0    6 /dev/null
colord     978           colord    0r   CHR    1,3      0t0    6 /dev/null
cups-brow  982             root    0r   CHR    1,3      0t0    6 /dev/null
gdm3      1064             root    0r   CHR    1,3      0t0    6 /dev/null
gdm-sessi 1084             root    0r   CHR    1,3      0t0    6 /dev/null
systemd   1108              gdm    0r   CHR    1,3      0t0    6 /dev/null
(sd-pam   1109              gdm    0r   CHR    1,3      0t0    6 /dev/null
gdm-wayla 1120              gdm    0u   CHR    4,1      0t0   20 /dev/tty1
dbus-daem 1122              gdm    0u   CHR    1,3      0t0    6 /dev/null
gnome-ses 1124              gdm    0r   CHR    1,3      0t0    6 /dev/null
gnome-she 1130              gdm  mem    CHR  226,0           223 /dev/dri/card0
gnome-she 1130              gdm    0r   CHR    1,3      0t0    6 /dev/null
gnome-she 1130              gdm   11u   CHR  226,0      0t0  223 /dev/dri/card0
gnome-she 1130              gdm   12u   CHR  226,0      0t0  223 /dev/dri/card0
upowerd   1143             root    0r   CHR    1,3      0t0    6 /dev/null
upowerd   1143             root   11r   CHR  13,64      0t0  149 /dev/input/event0
Xwayland  1160              gdm  mem    CHR  226,0           223 /dev/dri/card0
Xwayland  1160              gdm    0r   CHR    1,3      0t0    6 /dev/null
Xwayland  1160              gdm    9u   CHR  226,0      0t0  223 /dev/dri/card0
Xwayland  1160              gdm   10u   CHR  226,0      0t0  223 /dev/dri/card0
at-spi-bu 1177              gdm    0r   CHR    1,3      0t0    6 /dev/null
dbus-daem 1182              gdm    0u   CHR    1,3      0t0    6 /dev/null
at-spi2-r 1184              gdm    0u   CHR    1,3      0t0    6 /dev/null
pulseaudi 1188              gdm    0r   CHR    1,3      0t0    6 /dev/null
pulseaudi 1188              gdm   18u   CHR  116,2      0t0  525 /dev/snd/controlC0
pulseaudi 1188              gdm   25u   CHR  116,2      0t0  525 /dev/snd/controlC0
pulseaudi 1188              gdm   30u   CHR  116,2      0t0  525 /dev/snd/controlC0
rtkit-dae 1189            rtkit    0r   CHR    1,3      0t0    6 /dev/null
ibus-daem 1212              gdm    0r   CHR    1,3      0t0    6 /dev/null
ibus-dcon 1215              gdm    0r   CHR    1,3      0t0    6 /dev/null
ibus-dcon 1215              gdm    1w   CHR    1,3      0t0    6 /dev/null
ibus-dcon 1215              gdm    2w   CHR    1,3      0t0    6 /dev/null
ibus-x11  1218              gdm    0r   CHR    1,3      0t0    6 /dev/null
ibus-x11  1218              gdm    1w   CHR    1,3      0t0    6 /dev/null
ibus-x11  1218              gdm    2w   CHR    1,3      0t0    6 /dev/null
ibus-x11  1218              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
ibus-port 1220              gdm    0u   CHR    1,3      0t0    6 /dev/null
boltd     1232             root    0r   CHR    1,3      0t0    6 /dev/null
packageki 1233             root    0r   CHR    1,3      0t0    6 /dev/null
gsd-xsett 1234              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-xsett 1234              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
gsd-a11y- 1239              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-clipb 1240              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-clipb 1240              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
gsd-color 1241              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-color 1241              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
gsd-datet 1245              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-house 1246              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-keybo 1247              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-keybo 1247              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
gsd-media 1251              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-media 1251              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
gsd-mouse 1252              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-power 1253              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-power 1253              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
gsd-print 1254              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-rfkil 1257              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-scree 1260              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-shari 1261              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-smart 1272              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-sound 1274              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-wacom 1275              gdm    0r   CHR    1,3      0t0    6 /dev/null
gsd-wacom 1275              gdm    4u   CHR  226,0      0t0  223 /dev/dri/card0
dconf-ser 1288              gdm    0u   CHR    1,3      0t0    6 /dev/null
ibus-engi 1293              gdm    0r   CHR    1,3      0t0    6 /dev/null
ibus-engi 1293              gdm    1w   CHR    1,3      0t0    6 /dev/null
ibus-engi 1293              gdm    2w   CHR    1,3      0t0    6 /dev/null
gdm-sessi 1340             root    0r   CHR    1,3      0t0    6 /dev/null
canonical 1405             root    0r   CHR    1,3      0t0    6 /dev/null
whoopsie  1408         whoopsie    0r   CHR    1,3      0t0    6 /dev/null
kerneloop 1412         kernoops    0u   CHR    1,3      0t0    6 /dev/null
kerneloop 1412         kernoops    1u   CHR    1,3      0t0    6 /dev/null
kerneloop 1412         kernoops    2u   CHR    1,3      0t0    6 /dev/null
kerneloop 1426         kernoops    0u   CHR    1,3      0t0    6 /dev/null
kerneloop 1426         kernoops    1u   CHR    1,3      0t0    6 /dev/null
kerneloop 1426         kernoops    2u   CHR    1,3      0t0    6 /dev/null
teamviewe 1437             root    0r   CHR    1,3      0t0    6 /dev/null
teamviewe 1437             root    1w   CHR    1,3      0t0    6 /dev/null
teamviewe 1437             root    2u   CHR    1,3      0t0    6 /dev/null
systemd   1444            ursus    0r   CHR    1,3      0t0    6 /dev/null
(sd-pam   1445            ursus    0r   CHR    1,3      0t0    6 /dev/null
gnome-key 1528            ursus    0r   CHR    1,3      0t0    6 /dev/null
gnome-key 1528            ursus    1r   CHR    1,3      0t0    6 /dev/null
gnome-key 1528            ursus    2r   CHR    1,3      0t0    6 /dev/null
gnome-key 1528            ursus    3r   CHR    1,9      0t0   11 /dev/urandom
gdm-x-ses 1672            ursus    0u   CHR    4,2      0t0   21 /dev/tty2
Xorg      1674            ursus  mem    CHR  226,0           223 /dev/dri/card0
Xorg      1674            ursus    0u   CHR    4,2      0t0   21 /dev/tty2
Xorg      1674            ursus   11u   CHR    4,2      0t0   21 /dev/tty2
Xorg      1674            ursus   12u   CHR  226,0      0t0  223 /dev/dri/card0
Xorg      1674            ursus   13u   CHR  226,0      0t0  223 /dev/dri/card0
Xorg      1674            ursus   21u   CHR  13,67      0t0  152 /dev/input/event3
Xorg      1674            ursus   24u   CHR  13,69      0t0  288 /dev/input/event5
Xorg      1674            ursus   25u   CHR  13,70      0t0  290 /dev/input/event6
Xorg      1674            ursus   26u   CHR  13,65      0t0  150 /dev/input/event1
Xorg      1674            ursus   27u   CHR  13,66      0t0  151 /dev/input/event2
Xorg      1674            ursus   28u   CHR  13,78      0t0  513 /dev/input/event14
Xorg      1674            ursus   29u   CHR  13,75      0t0  466 /dev/input/event11
Xorg      1674            ursus   30u   CHR  13,76      0t0  468 /dev/input/event12
Xorg      1674            ursus   31u   CHR  13,77      0t0  477 /dev/input/event13
Xorg      1674            ursus   32u   CHR  13,73      0t0  437 /dev/input/event9
Xorg      1674            ursus   33u   CHR  13,72      0t0  436 /dev/input/event8
Xorg      1674            ursus   34u   CHR  13,74      0t0  458 /dev/input/event10
Xorg      1674            ursus   35u   CHR  13,68      0t0  155 /dev/input/event4
Xorg      1674            ursus   36u   CHR  13,71      0t0  432 /dev/input/event7
dbus-daem 1718            ursus    0u   CHR    1,3      0t0    6 /dev/null
gnome-ses 1726            ursus    0r   CHR    1,3      0t0    6 /dev/null
ssh-agent 1809            ursus    0u   CHR    1,3      0t0    6 /dev/null
ssh-agent 1809            ursus    1u   CHR    1,3      0t0    6 /dev/null
ssh-agent 1809            ursus    2u   CHR    1,3      0t0    6 /dev/null
at-spi-bu 1812            ursus    0r   CHR    1,3      0t0    6 /dev/null
dbus-daem 1817            ursus    0u   CHR    1,3      0t0    6 /dev/null
at-spi2-r 1819            ursus    0u   CHR    1,3      0t0    6 /dev/null
gnome-she 1836            ursus  mem    CHR  226,0           223 /dev/dri/card0
gnome-she 1836            ursus    0r   CHR    1,3      0t0    6 /dev/null
gnome-she 1836            ursus    9u   CHR  226,0      0t0  223 /dev/dri/card0
gvfsd     1842            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfsd-fus 1847            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfsd-fus 1847            ursus    3u   CHR 10,229      0t0   85 /dev/fuse
pulseaudi 1858            ursus    0r   CHR    1,3      0t0    6 /dev/null
pulseaudi 1858            ursus    1w   CHR    1,3      0t0    6 /dev/null
pulseaudi 1858            ursus    2w   CHR    1,3      0t0    6 /dev/null
pulseaudi 1858            ursus   17u   CHR  116,2      0t0  525 /dev/snd/controlC0
pulseaudi 1858            ursus   24u   CHR  116,2      0t0  525 /dev/snd/controlC0
pulseaudi 1858            ursus   29u   CHR  116,2      0t0  525 /dev/snd/controlC0
ibus-daem 1882            ursus    0r   CHR    1,3      0t0    6 /dev/null
ibus-dcon 1886            ursus    0r   CHR    1,3      0t0    6 /dev/null
ibus-dcon 1886            ursus    1w   CHR    1,3      0t0    6 /dev/null
ibus-dcon 1886            ursus    2w   CHR    1,3      0t0    6 /dev/null
ibus-x11  1888            ursus    0r   CHR    1,3      0t0    6 /dev/null
ibus-x11  1888            ursus    1w   CHR    1,3      0t0    6 /dev/null
ibus-x11  1888            ursus    2w   CHR    1,3      0t0    6 /dev/null
ibus-port 1890            ursus    0u   CHR    1,3      0t0    6 /dev/null
gnome-she 1905            ursus    0u   CHR    1,3      0t0    6 /dev/null
evolution 1920            ursus    0r   CHR    1,3      0t0    6 /dev/null
goa-daemo 1928            ursus    0u   CHR    1,3      0t0    6 /dev/null
goa-daemo 1928            ursus   13r   CHR    1,9      0t0   11 /dev/urandom
dconf-ser 1930            ursus    0u   CHR    1,3      0t0    6 /dev/null
gvfsd-met 1933            ursus    0r   CHR    1,3      0t0    6 /dev/null
goa-ident 1949            ursus    0u   CHR    1,3      0t0    6 /dev/null
gvfs-udis 1953            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfs-mtp- 1958            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfs-goa- 1962            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfs-gpho 1966            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfs-afc- 1970            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-mouse 1975            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-power 1976            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-print 1978            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-rfkil 1980            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-rfkil 1980            ursus    7u   CHR  10,62      0t0    4 /dev/rfkill
gsd-rfkil 1980            ursus   10w   CHR  10,62      0t0    4 /dev/rfkill
gsd-scree 1982            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-shari 1983            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-smart 1987            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-sound 1992            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-xsett 1993            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-wacom 1998            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-a11y- 2009            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-color 2010            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-datet 2014            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-clipb 2016            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-keybo 2018            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-media 2019            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-house 2022            ursus    0r   CHR    1,3      0t0    6 /dev/null
gsd-print 2067            ursus    0r   CHR    1,3      0t0    6 /dev/null
gnome-sof 2070            ursus    0r   CHR    1,3      0t0    6 /dev/null
gnome-sof 2070            ursus   16r   CHR    1,9      0t0   11 /dev/urandom
gsd-disk- 2077            ursus    0r   CHR    1,3      0t0    6 /dev/null
nautilus- 2079            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfsd-tra 2102            ursus    0r   CHR    1,3      0t0    6 /dev/null
evolution 2117            ursus    0r   CHR    1,3      0t0    6 /dev/null
ibus-engi 2124            ursus    0r   CHR    1,3      0t0    6 /dev/null
ibus-engi 2124            ursus    1w   CHR    1,3      0t0    6 /dev/null
ibus-engi 2124            ursus    2w   CHR    1,3      0t0    6 /dev/null
evolution 2136            ursus    0r   CHR    1,3      0t0    6 /dev/null
evolution 2147            ursus    0r   CHR    1,3      0t0    6 /dev/null
evolution 2166            ursus    0r   CHR    1,3      0t0    6 /dev/null
fwupd     2198             root    0r   CHR    1,3      0t0    6 /dev/null
update-no 2913            ursus    0r   CHR    1,3      0t0    6 /dev/null
deja-dup- 3027            ursus    0r   CHR    1,3      0t0    6 /dev/null
gvfsd-htt 4800            ursus    0r   CHR    1,3      0t0    6 /dev/null
dhclient  8029             root    0r   CHR    1,3      0t0    6 /dev/null
dhclient  8029             root    1w   CHR    1,3      0t0    6 /dev/null
dhclient  8029             root    2w   CHR    1,3      0t0    6 /dev/null
gnome-ter 8220            ursus    0r   CHR    1,3      0t0    6 /dev/null
gnome-ter 8220            ursus   13u   CHR    5,2      0t0   88 /dev/ptmx

Sandu Ursu

Asked: 2018-10-07 09:29:40 +0800 CST

Install Ubuntu 18.04 on Dell XPS 15 9570

1

I am trying to install Ubuntu 18.04 on my Dell XPS 15 9570.

I have followed the steps provided in the official tutorial.

However, I have stumbled on an issue.

When I boot from USB I am immediately directed to the "Try Ubuntu" option. I do not manage to choose "Install Ubuntu"

I connect to WiFi here. And then open the Install Ubuntu 18.04 icon from the desktop.

I select the language and the keyboard
I then press "Continue" on the following window:
I get to the following window:

If I try to press "Install Now" it tells me: When I try to press "change" or "+" the Install window closes.

I suspect the issue is that I need to change the drive to ACHI mode. But, I don't know why that would help and why can't it see the drive now.

I have create the bootable USB using Rufus 3.3 and then I have formatted it and tried again using UNetbootin. Same issue.

Sandu Ursu

Asked: 2018-09-08 04:43:11 +0800 CST

Chrome address bar & tabs turn black

7

My machine has Ubuntu 18.04 installed.

I use Google Chrome and I often work with Jupyter Notebooks.

When I launch the browser everything seems to work fine. After some time (~ 1-2 hours) the address bar and the tabs part turn black as shown below.

Not happy.

Graphics Card: NVIDIA Quadro M4000

The problem persists both when I use the NVIDIA proprietary driver and when I use the open source X.Org X server driver.

Sandu Ursu

Asked: 2018-06-11 23:46:32 +0800 CST

System Monitor does not launch

43

My PC has Ubuntu 18.04 installed.

It does not want to launch the System Monitor.

This seems to be an OS related issue. I have launched it before and it worked fine. Possibly due to some updates it has stopped working.

I am not looking for a solution. I just wanted to report this and I hope the issue will be remedied soon with an update.

I would like to know whether other people have the same issue with 18.04.

More info:

I try to launch it via: Super+A, open System Monitor. No errors. For a few seconds the "loading circle" tries to convince me that there is an attempt to launch it. But then it disappears and nothing happens.
I am not sure whether this is the command to open from the terminal, but when I run gnome-system-monitor, it tells me:

/snap/gnome-system-monitor/41/bin/desktop-launch: line 23: /home/sandu/.config/user-dirs.dirs: Permission denied
You need to connect this snap to the gnome platform snap.

You can do this with those commands:
snap install gnome-3-26-1604
snap connect gnome-system-monitor:gnome-3-26-1604 gnome-3-26-1604

(the '3-26-1604' number defines the platform version and might change)

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Install Ubuntu 18.04 on Dell XPS 15 9570

Chrome address bar & tabs turn black

System Monitor does not launch

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