Lucas Aimaretto's questions

So I have to use MS Teams for working purposes. And yes, Teams has been working nicely recently on Ubuntu 20.04. Until yesterday, where I was sharing my screen through a Teams audio call and my whole system crashed. I mean: the operating system crashed. I could not even kill the process. Even if I would open a console (ctrl+alt+t) and sudo kill -9 for Teams, I would get no answer.

I tried even a sudo reboot now but nothing happended. The machine was stucked there, freezed; no response at all. In the end I hade to power-off/on the laptop with the power button.

So I know this is somehow a description of the situation but very weird in the end. As I have read in another post, Ha! Never know that an application running without root permission can crash you OS.

Well, I have these files under /var/crash:

lucas@lucas:/var/crash$ ll
total 325636
drwxrwsrwt  2 root     whoopsie      4096 feb 11 09:51 ./
drwxr-xr-x 14 root     root          4096 abr 23  2020 ../
-rw-r-----  1 lucas    whoopsie  47178713 feb 10 17:51 _usr_share_teams_teams.1000.crash
-rw-r--r--  1 lucas    whoopsie         0 feb 10 14:11 _usr_share_teams_teams.1000.upload
-rw-------  1 whoopsie whoopsie        37 feb 10 14:11 _usr_share_teams_teams.1000.uploaded

And I'm using Teams version :

lucas@lucas:/var/crash$ apt list teams
Listing... Done
teams/stable,now 1.3.00.30857 amd64 [installed]
N: There are 5 additional versions. Please use the '-a' switch to see them.

Has anyone experienced something like this before? Any hint or idea/suggestion?

Thanks.

I've searched the web already about this issue. It seems many are facing it, but unfortunately none of those solutions seemed to have worked with me.

My latest is this one, where I've reinstalled the NIC driver.

I've also tried adding my card to the file /etc/network/interfaces so as to avoid NetworkManager using it, but the result is the same: endless DHCP Discover messages and no OFFER in response.

Sep  2 14:25:21 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep  2 14:25:22 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 19 (xid=0xa5e64914)
Sep  2 14:25:33 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep  2 14:25:41 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 11 (xid=0xa5e64914)
Sep  2 14:25:45 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 21 (xid=0xc5f73c43)
Sep  2 14:25:52 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 20 (xid=0xa5e64914)
Sep  2 14:26:06 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 17 (xid=0xc5f73c43)
Sep  2 14:26:12 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 9 (xid=0xa5e64914)
Sep  2 14:26:21 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 14 (xid=0xa5e64914)
Sep  2 14:26:23 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 16 (xid=0xc5f73c43)
Sep  2 14:26:35 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 16 (xid=0xa5e64914)
Sep  2 14:26:39 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 10 (xid=0xc5f73c43)
Sep  2 14:26:49 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep  2 14:26:51 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 8 (xid=0xa5e64914)
Sep  2 14:26:59 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xa5e64914)
Sep  2 14:27:01 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 7 (xid=0xc5f73c43)
Sep  2 14:27:08 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 9 (xid=0xc5f73c43)
Sep  2 14:27:11 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 15 (xid=0xa5e64914)
Sep  2 14:27:17 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 14 (xid=0xc5f73c43)
Sep  2 14:27:26 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 19 (xid=0xa5e64914)
Sep  2 14:27:31 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 7 (xid=0xc5f73c43)
Sep  2 14:27:38 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 8 (xid=0xc5f73c43)
Sep  2 14:27:45 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 21 (xid=0xa5e64914)
Sep  2 14:27:46 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 9 (xid=0xc5f73c43)
Sep  2 14:27:55 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 7 (xid=0xc5f73c43)
Sep  2 14:28:02 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 12 (xid=0xc5f73c43)
Sep  2 14:28:06 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 18 (xid=0xa5e64914)
Sep  2 14:28:14 lucas-HP-240-G6-Notebook-PC dhclient[4514]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 17 (xid=0xc5f73c43)
Sep  2 14:28:24 lucas-HP-240-G6-Notebook-PC dhclient[4045]: DHCPDISCOVER on eno1 to 255.255.255.255 port 67 interval 20 (xid=0xa5e64914)

I've tried a different PC on my switch port, and it is getting and IPv4 address, so not the switch nor the DCHP Server are faulty.

Also, my wifi card gets connected to the AP.

This is my system:

lucas@lucas-HP-240-G6-Notebook-PC:~$ uname -a
Linux lucas-HP-240-G6-Notebook-PC 4.4.0-161-generic #189-Ubuntu SMP Tue Aug 27 08:10:16 UTC 2019 x86_64 x86_64 x86_64 GNU/Li

lucas@lucas-HP-240-G6-Notebook-PC:~$ lshw -c network
WARNING: you should run this program as super-user.
  *-network               
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eno1
       version: 15
       serial: f4:30:b9:9e:5f:73
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.046.00-NAPI duplex=full latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:126 ioport:4000(size=256) memory:b1104000-b1104fff memory:b1100000-b1103fff
  *-network
       description: Wireless interface
       product: Realtek Semiconductor Co., Ltd.
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlo1
       version: 00
       serial: 40:9f:38:22:15:ef
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl8723de ip=10.10.39.74 latency=0 multicast=yes wireless=IEEE 802.11bgn
       resources: irq:131 ioport:3000(size=256) memory:b1000000-b100ffff
  *-network DISABLED
       description: Ethernet interface
       physical id: 1
       logical name: virbr0-nic
       serial: 52:54:00:da:ff:85
       size: 10Mbit/s
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.


lucas@lucas-HP-240-G6-Notebook-PC:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether f4:30:b9:9e:5f:73 brd ff:ff:ff:ff:ff:ff
    inet 169.254.8.56/16 brd 169.254.255.255 scope link eno1:avahi
       valid_lft forever preferred_lft forever
    inet6 fe80::8ae2:b747:3347:da25/64 scope link 
       valid_lft forever preferred_lft forever
3: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 40:9f:38:22:15:ef brd ff:ff:ff:ff:ff:ff
    inet 10.10.39.74/22 brd 10.10.39.255 scope global dynamic wlo1
       valid_lft 13766sec preferred_lft 13766sec
    inet6 fe80::cfdf:3c42:b81f:1af6/64 scope link 
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether 52:54:00:da:ff:85 brd ff:ff:ff:ff:ff:ff

This is the content of /etc/network/interfaces...

lucas@lucas-HP-240-G6-Notebook-PC:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto eno1
iface eno1 inet dhcp

any hint?

thanks!

So I've been testing ACL's in Linux and they work as intended. I have, for example, this folder where I've stablished permissions for users belonging to the gruop share. So far, so good...

lucas@lucas:/$ getfacl testAcl/
# file: testAcl/
# owner: root
# group: root
user::rwx
group::rwx
group:share:rwx
mask::rwx
other::---
default:user::rwx
default:group::rwx
default:group:share:rwx
default:mask::rwx
default:other::---

This works fine. Once the ACL has been set, users can or cannot go into the specified folder, as per their group membership.

But I'm interested in something a little different: users usually log into the server, and they land in their /home/user folder. How can I set up an ACL so users can't leave the /home directory but also be able to go deeper inside /home/share, for example?

I've though about two options so far:

• All users belonging to group adm CAN leave /home, or ...
• All users belonging to group share CANNOT leave /home.

How can I set that up using setfacl?

I have ubuntu server 16.04.5 and I notice that some swap space has been assigned some time ago, but is not being released.

Is there anything I should do? Or eventually it will be freed? How can I check which process(es) is(are) using it?

Thanks!

So, I'm having some overheating problems with an HP Envy 15 that are driving me nuts. See this and this for reference.

Anyway, I did an Ubuntu 18.04 fresh install. Also installed tlp and cpufrequtils. So, if I do tlp stat -p ...

+++ Processor
CPU model      = Intel(R) Core(TM) i7-4510U CPU @ 2.00GHz

[....]

/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver    = intel_pstate
/sys/devices/system/cpu/cpu3/cpufreq/scaling_governor  = performance
/sys/devices/system/cpu/cpu3/cpufreq/scaling_available_governors = performance powersave
/sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq  =  3100000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq  =  3100000 [kHz]

/sys/devices/system/cpu/intel_pstate/min_perf_pct      =  25 [%]
/sys/devices/system/cpu/intel_pstate/max_perf_pct      = 100 [%]
/sys/devices/system/cpu/intel_pstate/no_turbo          =   0
/sys/devices/system/cpu/intel_pstate/turbo_pct         =  50 [%]
/sys/devices/system/cpu/intel_pstate/num_pstates       =  24

Now, since I want to use a powersave governor, as per this, I get to use it.

+++ Processor
CPU model      = Intel(R) Core(TM) i7-4510U CPU @ 2.00GHz

[....]

/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver    = intel_pstate
/sys/devices/system/cpu/cpu3/cpufreq/scaling_governor  = powersave
/sys/devices/system/cpu/cpu3/cpufreq/scaling_available_governors = performance powersave
/sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq  =  3100000 [kHz]
/sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq  =  3100000 [kHz]

/sys/devices/system/cpu/intel_pstate/min_perf_pct      =  25 [%]
/sys/devices/system/cpu/intel_pstate/max_perf_pct      = 100 [%]
/sys/devices/system/cpu/intel_pstate/no_turbo          =   0
/sys/devices/system/cpu/intel_pstate/turbo_pct         =  50 [%]
/sys/devices/system/cpu/intel_pstate/num_pstates       =  24

So far, so good.

Two things do call my attention:

1. If I do start using my laptopt again, don't know why, but from time to time, the tlp stat -p shows again that the scaling_governor=performance.
2. Why are scaling_min_freq and scaling_max_freq equal? I'd like to reduce both of them to see if I can somehow control the overheating problem that I'm facing.

How can I avoid the performance governor? How can I tune the min and max scaling?

thanks!

Lucas

If I use the kernel that came with ubuntu 18.04 after a fresh-install, I can use the nvidia GPU.

However, after using ukuu to install kernel 4.17.2 I can't use the nvidia GPU anymore.

lucas@test:/boot$ uname -a
Linux test 4.17.2-041702-generic #201806160433 SMP Sat Jun 16 08:35:37 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

lucas@test:~$ prime-select query
nvidia

lucas@test:~$ glxinfo|egrep "OpenGL vendor|OpenGL renderer"
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile 

When running nvidia-settings I get to see:

ERROR: NVIDIA driver is not loaded
ERROR: Error querying enabled displays on GPU 0 (Missing Extension).
ERROR: Error querying connected displays on GPU 0 (Missing Extension).

** Message: 20:49:20.826: PRIME: Requires offloading
** Message: 20:49:20.826: PRIME: is it supported? yes

ERROR: nvidia-settings could not find the registry key file. This file should
       have been installed along with this driver at
       /usr/share/nvidia/nvidia-application-profiles-key-documentation. The
       application profiles will continue to work, but values cannot be
       prepopulated or validated, and will not be listed in the help text.
       Please see the README for possible values and descriptions.

Interestingly, there is no /usr/share/nvidia/nvidia-application-profiles-key-documentation but a nvidia-application-profiles-390.48-key-documentation.

lucas@test:/usr/share/nvidia$ ls -l
total 16
-rw-r--r-- 1 root root 6041 mar 22 03:47 nvidia-application-profiles-390.48-key-documentation
-rw-r--r-- 1 root root 6052 mar 22 03:47 nvidia-application-profiles-390.48-rc

Everything is solved if -at boot time- I go choose kernel 4.15.0-22.generic, which is the kernel that came with the fresh install.

What can I do?

Thanks!

I've done a fresh install of ubuntu 18.04. My system is the following:

lucas@test:~$ inxi -F
System:    Host: test Kernel: 4.15.0-20-generic x86_64 bits: 64 Desktop: Gnome 3.28.1 Distro: Ubuntu 18.04 LTS
Machine:   Device: laptop System: Hewlett-Packard product: HP ENVY 15 Notebook Pc v: 09A2100000400000000000000 serial: N/A
           Mobo: Hewlett-Packard model: 228D v: 77.12 serial: N/A UEFI: Insyde v: F.04 date: 05/15/2014
Battery    BAT0: charge: 43.2 Wh 100.0% condition: 43.2/43.2 Wh (100%)
CPU:       Dual core Intel Core i7-4510U (-MT-MCP-) cache: 4096 KB
           clock speeds: max: 3100 MHz 1: 1327 MHz 2: 1084 MHz 3: 1000 MHz 4: 982 MHz
Graphics:  Card-1: Intel Haswell-ULT Integrated Graphics Controller
           Card-2: NVIDIA GM108M [GeForce 840M]
           Display Server: x11 (X.Org 1.19.6 ) drivers: modesetting,nvidia (unloaded: fbdev,vesa,nouveau)
           Resolution: [email protected], [email protected]
           OpenGL: renderer: GeForce 840M/PCIe/SSE2 version: 4.6.0 NVIDIA 390.48
Audio:     Card-1 Intel 8 Series HD Audio Controller driver: snd_hda_intel Sound: ALSA v: k4.15.0-20-generic
           Card-2 Intel Haswell-ULT HD Audio Controller driver: snd_hda_intel
Network:   Card-1: Broadcom Limited BCM43142 802.11b/g/n driver: wl
           IF: wlo1 state: up mac: d8:5d:e2:cc:38:5d
           Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
           IF: eno1 state: down mac: 70:5a:0f:1c:fb:cd
Drives:    HDD Total Size: 1000.2GB (45.1% used)
           ID-1: /dev/sda model: ST1000LM024_HN size: 1000.2GB
Partition: ID-1: / size: 228G used: 6.0G (3%) fs: ext4 dev: /dev/sda2
           ID-2: /home size: 681G used: 407G (64%) fs: ext4 dev: /dev/sda3
           ID-3: swap-1 size: 8.00GB used: 0.00GB (0%) fs: swap dev: /dev/sda4
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 65.0C mobo: N/A gpu: 38C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 276 Uptime: 41 min Memory: 3103.8/15970.9MB Client: Shell (bash) inxi: 2.3.56 

Nevertheless, I get high CPU spikes from time to time eventough I really do use it so far for web browsing and libreoffice. With htop I get to see that:

• Firefox consumes most of the CPU which makes the fans of the laptop go crazy.
• doing apt-get upgrade makes CPU go high
• playing youtube videos above 50% of CPU
• etc ...

Is there anything I can look at to find out what's going on?

I've a bluetooth speaker and got it to work. But audio is terrible, skips lots of times:

Aug 28 21:02:25 test pulseaudio[2537]: [bluetooth] module-bluez5-device.c: Skipping 309976 us (= 54676 bytes) in audio stream
Aug 28 21:02:25 test pulseaudio[2537]: [bluetooth] module-bluez5-device.c: Skipping 84982 us (= 14988 bytes) in audio stream
Aug 28 21:02:26 test pulseaudio[2537]: [bluetooth] module-bluez5-device.c: Skipping 208448 us (= 36768 bytes) in audio stream

Since the wifi and BT come altogether, thought on turning off the wifi connection for a while: bingo! with wifi disabled BT audio sounds perfect.

lucas@test:~$ sudo lshw -c Network 
  *-network               
   description: Wireless interface
   product: BCM43142 802.11b/g/n
   vendor: Broadcom Corporation
   physical id: 0
   bus info: pci@0000:08:00.0
   logical name: wlo1
   version: 01
   serial: d8:5d:e2:cc:38:5d
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=wl0 driverversion=6.30.223.271 (r587334) ip=192.168.0.2 latency=0 multicast=yes wireless=IEEE 802.11
   resources: irq:18 memory:b5500000-b5507fff

lucas@test:~$ sudo lsusb -v | grep Blue
Bus 001 Device 005: ID 0a5c:216c Broadcom Corp. BCM43142A0 Bluetooth    Device
  idProduct          0x216c BCM43142A0 Bluetooth Device

I'm using:

lucas@test:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:    16.04
Codename:   xenial

lucas@test:~$ uname -a
Linux test 4.10.0-32-generic #36~16.04.1-Ubuntu SMP Wed Aug 9 09:19:02 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Is there any possible way of having both BT+wifi active without getting this choppy audio? Might it be due to channel interference?

thanks!