Alex's questions

Using ubuntu 22.04 I tried to assign the two IP addresses 192.168.200.100 and 169.254.1.0 to the ethernet device enx00e04c680202. Following this tutorial and this answer I created a file /etc/netplan/01-network-config_home.yaml with the following content:

network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enx00e04c680202:
      addresses:
        - 192.168.200.100/24
        - 169.254.1.100/24
      routes:
       - to: default
         via: 192.168.200.220
      nameservers:
        addresses:
          - 8.8.8.8   # Add your DNS server IP address
          - 8.8.4.4   # Add another DNS server IP address

and applied the changes using the command

sudo netplan apply

I checked the configuration with the command ip address show dev enx00e04c680202, but it seems only one address has been applied:

3: enx00e04c680202: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:4c:68:02:02 brd ff:ff:ff:ff:ff:ff
    inet 192.168.200.100/24 brd 192.168.200.255 scope global noprefixroute enx00e04c680202
       valid_lft forever preferred_lft forever

But the other configured address seems to be working! Even it does not show up with the command

ip address show dev enx00e04c680202

I am able to connect to a device with IP address 169.254.1.0 that is connected only to that ethernet adapter.

When I add an IP address to that adapter enx00e04c680202 using the following command

sudo ip addr add 169.254.1.100/24 dev enx00e04c680202

then I see the following output of the command ip address show dev enx00e04c680202:

3: enx00e04c680202: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:4c:68:02:02 brd ff:ff:ff:ff:ff:ff
    inet 192.168.200.100/24 brd 192.168.200.255 scope global noprefixroute enx00e04c680202
       valid_lft forever preferred_lft forever
    inet 169.254.1.100/24 scope global enx00e04c680202
       valid_lft forever preferred_lft forever

It shows the two IP addresses not only one. Maybe that is a bug with ip address show?

I googled and took a look at this page for example, and I know that the arp command is supposed to show the mapping between an Internet Protocol (IP) address and a Media Access Control (MAC) address.

But it does not make sense to me when I look at the output on a 22.04 ubuntu system. Here arp gives:

_gateway (192.168.107.172) at 3a:65:d4:6d:20:cf [ether] on wlp0s20f3

Here I would assume that there is an ethernet adapter with the MAC address 3a:65:d4:6d:20:cf which has the IP address 192.168.107.172. But when looking at ifconfig I do not see this IP address:

enp84s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 7c:57:58:80:1c:61  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device memory 0x54000000-540fffff  

enx00e04c680202: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.200.100  netmask 255.255.255.0  broadcast 192.168.200.255
        ether 00:e0:4c:68:02:02  txqueuelen 1000  (Ethernet)
        RX packets 124  bytes 11140 (11.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 28  bytes 2981 (2.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enxa0cec8c97ebc: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether a0:ce:c8:c9:7e:bc  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 13849  bytes 1664000 (1.6 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13849  bytes 1664000 (1.6 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp0s20f3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.107.238  netmask 255.255.255.0  broadcast 192.168.107.255
        inet6 fe80::6a85:ef4a:7e3c:be96  prefixlen 64  scopeid 0x20<link>
        inet6 2a01:cb16:2068:7c6c:8e00:94e:c979:548e  prefixlen 64  scopeid 0x0<global>
        inet6 2a01:cb16:2068:7c6c:d2f4:5a68:7bd8:e5d7  prefixlen 64  scopeid 0x0<global>
        ether 3c:e9:f7:a7:1c:0f  txqueuelen 1000  (Ethernet)
        RX packets 209228  bytes 203369040 (203.3 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 113025  bytes 26069725 (26.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I see that the adapter that was listed with arp ("wlp0s20f3") has the IP address 192.168.107.238 and not 192.168.107.172!

I also use an additional USB-Ethernet device ("enx00e04c680202") which does not show up in the arp list. Do USB-Ethernet adapters do not have a MAC address?

I check various pages HERE and HERE and HERE without answer...

In ubuntu 22.04.2 I am trying to read the data coming from a serial port. To find the correct port I do

sudo dmesg | grep tty

which gives

[    0.117304] printk: console [tty0] enabled
[    0.793135] 0000:00:16.3: ttyS4 at I/O 0x3060 (irq = 19, base_baud = 115200) is a 16550A
[    4.136977] usb 3-6.3.2: FTDI USB Serial Device converter now attached to ttyUSB0
[27184.158691] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[27190.409672] usb 3-6.3.2: FTDI USB Serial Device converter now attached to ttyUSB0

after disconnecting and reconnecting the USB device (around time 28180). Then according to this suggestion I do

screen /dev/ttyUSB0 115200

but all I get is

[screen is terminating]

So how to do it AS SIMPLE AS POSSIBLE without setting up configuration, clicking through menues or navigating on the command line through complex setup stuff? I just want to listen to some information that comes from this serial connection (which is connected to the laptop via USB).

On windows I could use

• hterm
• putty
• MOBA xterm

But what to use on ubuntu?

In order to show different time zones on my ubuntu desktop (Ubuntu 20.04.4) I installed gnome clocks, but after some while this is what I see:

I really don't need to see my current time zone three times. When I first started the app it looked on, the current time zone was shown only once. But then after time (like 10 minutes), the current timezone was duplicated. I cannot remove them.

Is there a fix to this problem, or exists a very similar app to just easily show one different time zone?

On Ubuntu 20.04 I am trying to run the following command

sudo apt-get update

which fails with the following error:

E: Failed to fetch https://dl.bintray.com/loadimpact/deb/dists/stable/InRelease  403  Forbidden [IP: 35.158.216.221 443]
E: The repository 'https://dl.bintray.com/loadimpact/deb stable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I already tried to remove stuff like this

sudo rm -fr /var/lib/apt/lists/*

but this did not help. Anything else I can try to fix this problem?

I am trying to use the zoom videoconferencing application on ubuntu 16.04.7, but it does not seem to work.

I installed the probably latest version of zoom using the command

sudo apt install ./zoom_amd64.deb

which might have installed the version 5.3.465578.0920. At the end of the install process I got the message on the terminal

N: Can't drop privileges for downloading as file '/home/alex/Downloads/zoom_amd64.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

Not the slightest idea what it means, and if this is maybe the cause of the problem.

However, I am able to 'start' zoom by typing

zoom

This opens a window:

I click on "Sign In" then choose "Sign In with SSO", and here I choose the company domain and click on "Continue".

This opens a web-page which looks like follows:

Here I click on "Open xdg-open" and briefly an icon appears on the screen

which vanishes after about 5 seconds.

If I then click on "Launch zoom" the same pop-up appears, with no change. I uninstalled and reinstalled zoom.

Is there a way to fix this? Or does zoom just not work on ubuntu?

I did a check from a bootable Ubuntu USB stick and ran

sudo fsck -y /dev/sda2

on the main Linux partition in the computer. The output is something like

...
Pass 1B:  Rescanning for multiply-claimed blocks
Error while scanning inodes (207...): Inode checksum does not match inode

/dev/sda2: **** FILE SYSTEM WAS MODIFIED ***
e2fsck: aborted

/dev/sda2: **** FILE SYSTEM WAS MODIFIED ***

Exit-code: 9

Was that it? Or is there a way to repair the drive?

I am using Ubuntu 16.04, and for some unknown reason I am not able to open a terminal with CTRL + ALT + T. When I press these keys, nothing happens.

I also tried to start a terminal from Dash, but again nothing happens.

I never had a problem opening a terminal, opened it hundreds of times before with CTRL + ALT + T.

Luckily, I am able to open a terminal by using right-click and choosing "open Terminal". But why can't I open a terminal with CTRL+ALT+T anymore?

The Shortcut is still there (Settings -> Keyboard -> Shortcuts).

For a test of compiling some other package I require the exact version of sphinx on my Ubuntu 18.04.01.

I tried the following:

sudo apt-get install sphinx=1.3.6

but it says that there is no 'package sphinx'.

So how to do it?

I have a stereo device on which I can play a casette tape (the old magnetic storage devices before CD's). I want to capure the audio from the stereo (from the headphone jack; the only possibility) and record it digitally with a Ubuntu computer (with just a headphone output and USB connections).

How to do that?

I guess I need some external USB device to capture the audio and to be able to record it on the Ubuntu device. But what is the name of such a device?

Or is there another possibility?

On Ubuntu 14.04 I was updating some packages, did a reboot and found a kernel panic:

run-init: /sbin/init: No such file or directory
Target filesystem doesn't have requested /sbin/init
run-init: /sbin/init: No such file or directory
run-init: /etc/init: Permission denied     
run-init: /sbin/init: No such file or directory
/bin/sh: 0: Can't open splash
... Kernel Panic...
etc...

I booted the laptop with gparted-live USB stick and checked the partitions, which seem to be ok. So it does not seem to be a corrupted partition.

Any quick fixes? Or better wait one day to install Ubuntu 18.04 from scratch...?

I am using a 64GB flash drive with Ubuntu, and I still can read and write to it. But when I navigate to a certain folder is gives me the error message

Error when getting information for file '/media/alexander/D0f9-E846/Music/Misc/t....": Input/output error

Instead of the points there are some strange characters to see. I am not able to delete that directory.

The format is "W95 FAT32" and should stay in that format.

I assume formatting the flash drive will help only? Or is there another way of fixing this issue?

On ubuntu 14.04 I have been connected to an audio device via bluetooth (bluetooth manager; audio sink). The audio plays on the external bluetooth device when I start an audio file with mplayer, but after 30 to 60 seconds, without doing something, I get the message

Audio device got stuck!

and there is no more audio on the bluetooth device. Even restarting the bluetooth service with

sudo /etc/init.d/bluetooth restart

does not help - not even the bluetooth manager will restart. The only help is to restart the laptop, connect again with bluetooth only to lose connection again after 30-60 seconds...

How to find out what is going on?

On Ubuntu 14.04 I have sometimes problems to connect to a bluetooth device (audio sink). Sometime it works, sometimes it does not work.

I have followed the solution given here and looked at this suggestion, but still I have the problem sometimes. I want to be able to use the bluetooth device as audio sink without rebooting my device!

I get the following errors:

> sudo pactl load-module module-bluetooth-discover
Failure: Module initialization failed

I still have made the changes as suggested for the first solution.

Additional information:

• I have two bluetooth icons in my Status menu. Maybe there are competing apps/services/tools installed?
• When trying to connect to the audio sink using the Bluetooth Manager I get the message Connection Failed: Stream setup failed.

On Ubuntu 14.04.5 I just upgraded firefox to version 50.0; now there is a message on some pages which reads:

libavcodec may be vulnerable or is not supported, and should be updated to play videos

So how can I update libavcodec?

A simple

sudo apt-get install libavcodec

gives the following output:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libavcodec

So maybe I don't have libavcodec installed in the first place? So why do I get this message...?

I am using Ubuntu 14.04 and I am trying to connect to a Windows 10 Home computer remotely on the network using Remmina. Remote connections seem to be enabled on the Windows 10 machine (at least for a user [email protected]). However, no matter if I try to connect (within the local network 192.168.1.20) as admin or the user with [email protected] I always get the error

Unable to connect to rdp server 192.168.1.20

after 1-2 minutes after I tried to connect. I also tried to use various Security protocols (TLS, RDP), and I checked the directory ~/.freerdp/, which is empty.

Searching the internet for some help I only found the above tips I already tried. Is there something else I can try to resolve this problem?

I have trouble installing skype in Ubuntu 13.10. Installing skype through the Software Center gives an error

Segmentation fault (core dumped)

and after removing skype by using sudo apt-get remove skype I tried to install skype with

sudo apt-get install skype

which gives an error

E: Package 'skype:i386' has no installation candidate

Any ideas how I can install skype?

I have a new installation of Ubuntu 13.10 on a lenovo laptop, for which I decided to install KDE. After I logged out and in and choosing KDE plasma workspace, all worked fine.

But later, when I log into KDE plasma workspace, its loads normally, and I see the choosen background and the standard KDE panel at the bottom of the screen. I can move the mouse around, but that's it. I cannot do anything else. Klicking on anything or typing does not do anything, all is frozen. I have to power the laptop off the hard way! I tried several times, without any luck of able to use KDE.

Logging in to the Ubuntu standard desktop, on the other hand, works just fine.

How can I fix this behaviour?

Please let me know any log entry, software installation, hardware device etc. you need to know in order to solve this problem (and how I e.g. can figure out the type of graphics card or whatever...).

Additional information:

• Extract from kdm.log:

  Loading extension GLX
  klauncher(1266) kdemain: No DBUS session-bus found. Check if you have started the DBUS server. 
  kdeinit4: Communication error with launcher. Exiting!
  kdmgreet(1212)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed:  "Not connected to D-Bus server"
  

• The suggestion made here to press ALT+SHIFT+F12 did not help

• I also renamed each file containing the phrase plasma under .kde/share/config as suggested here, which also did not resolve my problem. The background image has changed and I saw two terminals open, but locked to the panel at the bottom. I could not open them.

• lspci -v shows the following for the graphics card:

  00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
      Subsystem: Lenovo Device 3977
      Flags: fast devsel, IRQ 16
      Memory at c0000000 (64-bit, non-prefetchable) [size=4M]
      Memory at b0000000 (64-bit, prefetchable) [size=256M]
      I/O ports at 3000 [size=64]
      Expansion ROM at <unassigned> [disabled]
      Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
      Capabilities: [d0] Power Management version 2
      Capabilities: [a4] PCI Advanced Features
  

• New user: If I add a new user, I am able to log-in to the KDE desktop (at least twice).

I am running Ubuntu 12.04 with python 2.7.3 installed. How can I update the version of python to 2.7.4?

apt-get install python2.7

does not install anything new

apt-get update python2.7

does not work as it does not accept arguments

apt-get upgrade python2.7

Installed version 2.7.3, but not change to version 2.7.4.

So: How to install the version 2.7.4 of python on Ubuntu 10.04?

I have a USB modem that is identified in Linux (Ubuntu 12.04) with lsusb as

Bus 001 Device 003: ID 0572:1329 Conexant Systems (Rockwell), Inc.

How to talk to that device (e.g. with microcom etc?)? What dev device should I use? There is no /dev/ttyUSBXXX available and just one /dev/ttyACM0.