Questions tagged [ubuntu]

Please don't use this tag just because your system is running Ubuntu. Use it **only** if your question is somehow specific to Ubuntu only. Note that https://askubuntu.com is specifically dedicated to Ubuntu questions.

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Why does ZFS scrub not complete?

First off let's start with what I'm running. This is a home media server running Ubuntu 16.10. I have one pool of mirrored 6 terabyte drives that are about half full. I built the system about a month ...
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  • 311
13 votes
0 answers
7k views

Graph is too large for cairo-renderer bitmaps Error

Im trying to use pyreverse to generate images of UML diagrams for a project source code. When I run the pyreverse command and specify to generate .png images, it runs and then after a while, it shows: ...
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8 votes
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Processor frequency stuck at minimum despite using performance governor. Kernel and hardware disagree on the frequency?

I am using a MacBook Retina with four processor cores on Linux (Ubuntu 18.04): $ grep -E '^model name|^cpu MHz' /proc/cpuinfo model name : Intel(R) Core(TM) i5-4258U CPU @ 2.40GHz cpu MHz : 799....
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  • 81
8 votes
2 answers
7k views

USB ports keep resetting on Linux

Problem USB Ports (2.0) keep resetting causing connected peripherals to stop working after some time. Hardware Motherboard: ASUS J1800I-C CPU: Intel(R) Celeron(R) CPU J1800 @ 2.41GHz RAM: 4GB ...
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  • 181
8 votes
2 answers
5k views

Cannot see packets arrive on application socket that were seen by Wireshark

Using Ubuntu 14 I have a Linux machine where there are two interfaces: eth1: 172.16.20.1 ppp0: 192.168.0.2 ppp0 is connected to a device which has a PPP interface (192.168.0.1) and a WAN interface (...
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  • 81
8 votes
2 answers
2k views

xorg.conf XkbOption ignored for terminate:ctrl_alt_bksp to restart X

I want Ctrl+Alt+Bksp to restart X, so I created an xorg.conf rule: /usr/share/X11/xorg.conf.d/53-zap.conf: Section "ServerFlags" Option "DontZap" "false" EndSection Section "InputClass" ...
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8 votes
5 answers
22k views

Ubuntu 20.04 upgrades breaks keyboard/mouse

I was using 19. Ubuntu recommended an update. I clicked all the buttons and let it do its thing. After the update restarted the computer, I tried using the mouse. Nothing. I tried the keyboard. ...
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7 votes
0 answers
3k views

Is there any undo command for clear in Linux?

I accidentally cleared my screen and I need to see my previous output, any way to see output/results of previous commands? I understand that I can see my past commands using history command but I am ...
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7 votes
1 answer
5k views

SSH Fails at "kex_exchange_identification"

I'm trying to connect over ssh to an Ubuntu 18.04 VM running in VMWare on my local machine. Local machine has openssh server up and running. Apple's default ssh binary fails connecting to VMs in ...
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7 votes
0 answers
3k views

Apple MagicTrackpad2 on Ubuntu

I bought an Apple Magic Trackpad2 and want to use it on Ubuntu 16.04. Actually moving the pointer works, but e.g. two finger scrolling or tap to click doesn't. So I came up with the following ...
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  • 171
7 votes
1 answer
23k views

How to get to recovery mode if grub screen does not appear?

I cannot login my Ubuntu12.04 (which is VM running on OSX using VMWARE FUSION 6) because I have changed permission of /tmp for some purpose before rebooting the machine. Thus I tried to boot Ubuntu ...
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  • 315
6 votes
1 answer
7k views

Ubuntu - lftp will not connect to ftps site (Fatal error: gnutls_handshake: An unexpected TLS packet was received.)

I have a specific ftps site that I cannot connect to with lftp. When I attempt to connect I get the error: Fatal error: gnutls_handshake: An unexpected TLS packet was received When I use gnutls-...
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  • 61
6 votes
3 answers
6k views

Failed to use partClone program to save or restore an image

I want to clone a Windows partition of a dual booted laptop which doesn't boot anymore as described in the following link. I don't know why but I can't clone a partition with Clonezilla. I only have ...
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6 votes
0 answers
4k views

Extremely high memory usage Android studio and emulator

After upgrading Android Studio to 2.3, I've encountered extremely high memory usage. Previously, I would keep my pc(including Android studio and emulator) on for several weeks, and RAM usage would ...
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6 votes
2 answers
7k views

Sound volume control does not work in Ubuntu

My sound volume control does not work when I'm logged in with my regular user, though the sound works correctly. What's weirder is that the sound control works when I'm logged in as guest. With my ...
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  • 171
5 votes
0 answers
301 views

How to fix a bad checksum error on mdadm raid5 array (Ubuntu)

I have a 4 x 4 TB drive configured in a raid5 array. Drives labeled as /dev/sdb1, /dev/sdc1, /dev/sdd1 & /dev/sde1 assembled as /dev/md0 mdadm assemble output When I tried to assemble the array I ...
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  • 51
5 votes
0 answers
1k views

Ubuntu 20.04 disable temporary IPv6 addresses

I have a very basic Ubuntu 20.04 server installation. I am trying to disable the system from using temporary IPv6 addresses. My netplan is as follows: network: ethernets: ens160: ...
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  • 151
5 votes
0 answers
1k views

Ubuntu 20.04 / Gnome 3.36.2 forgets dual-monitor settings when switching between PCs via KVM/KVMP switch

I have a Display Port KVM / KVMP switch to switch between two PCs (Ubuntu 20.04 , Windows 10). Whenever I switch back from the Windows 10 PC to the Ubuntu 20.04 I have to restore my dual monitor ...
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5 votes
1 answer
2k views

Ubuntu External Monitor Only Shows Mouse Cursor

I am new to Ubuntu and installed 18.04.04 as a dual boot with Windows 10 on an Alienware Laptop. When I connect it to an LG 34UM88 34" Ultrawide Monitor, I only see a black screen with the mouse ...
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  • 161
5 votes
0 answers
3k views

xrandr doesn't list display port

Edit 6 After upgrading to ubuntu 21.10 the remaining issue with gl support is solved magically after the upgrade. Edit 5 I started by comparing via meld /etc/X11, /etc/modprobe.d and /lib/modprobe.d ...
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5 votes
1 answer
2k views

Sound through only left speaker, (but hardware is OK)

I have Ubuntu 19.04, and I am facing issues with sounds. When playing audio, I get audio through only one of the speakers (the left one, that is). Also, the volume is pretty low. I run the same on ...
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5 votes
0 answers
664 views

Possible xorg memory leak

My problem in one picture : The memory usage of xorg as a child process of sddm keeps growing with time. Everytime I restart my computer, the problem reappears after a few dozens of minutes. I tried ...
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5 votes
0 answers
513 views

ThinkPad second "sticky" backspace key

I have bought a Lenovo ThinkPad T580, and noticed that in the upper right corner of the keyboard, there is a second backspace button (in addition to the other backspace button right above the ENTER-...
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5 votes
0 answers
2k views

Ubuntu pinging from link-local address instead of global

I have a network like this, (client 2001:10:1:100:0/64) -> router -> (server 2001:172:16:200:0/64) However, when I ping from client to the 172.16.200.0 network, (or anywhere) it always uses the link ...
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5 votes
0 answers
179 views

Why did apt not prompt me to confirm installing dependencies?

Usually, installing a package with dependencies that aren't currently installed will make apt confirm whether this is desired before proceeding to install: $ sudo apt install gnome-terminal Reading ...
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  • 611
5 votes
0 answers
8k views

RTNETLINK answers: File exists on Ubuntu Server 16.04

I have a fresh new install of Ubuntu Server 16.04. After installation, network connectivity was fine. I installed QuickBox, it's a seeding/torrent server software (https://quickbox.io). After the ...
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5 votes
0 answers
5k views

apt update keeps hanging, no way to troubleshoot

Apt update on Ubuntu 16.04 hangs randomly every view updates. Nothing I've tried can permanently fix it and I have no way to troubleshoot it. The only solution I have is to create a shell script to ...
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  • 369
5 votes
2 answers
10k views

Fingerprint reader on Asus Zenbook

So I have ZorinOS installed on my ASUS ZenBook UX330UA-AH54, however, FingerprintGUI shows my fingerprint sensor (Elantech I think) as an unknown device. Is there any custom software or fixes that can ...
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5 votes
0 answers
10k views

Dual monitor confusion in Ubuntu Gnome 17.10

N.b. Since this is an issue on a machine running "Ubuntu +1 (alpha)", it's out-of-bounds on AskUbuntu, so I'm hoping for some help here. I encountered some odd screen behaviour this morning. I have ...
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  • 203
5 votes
0 answers
4k views

Create virtual microphone and output sound to it

My goal is testing Video Room Application, so I'm going to create multiple virtual machines with virtual webcams and microphones. Webcam is working fine with v4l2loopback, but microphone is not. I'm ...
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5 votes
0 answers
12k views

Backup GPT table is corrupt. Fix will disappear at reboot

My recently installed ubuntu 16.04 system is not behaving correctly (does not boot). I did check the status of the hard drives using fdisk and I discovered that somehow the backup GPT table is corrupt....
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  • 151
5 votes
1 answer
4k views

A stop job is running for LVM

I use full disk encryption which uses an LVM. It uses like this in lsblk: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda ...
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5 votes
1 answer
1k views

Mounting nfs4 partition over ssh tunel

I am following this manual on how to mount an nfs port over an ssh tunnel: https://blogs.oracle.com/shepler/entry/tunneling_nfs_traffic_via_ssh I need this because I want to mount an nfs partition ...
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  • 169
5 votes
0 answers
5k views

Grub rescue after corrupted hard-drive ("read-only filesystem")

I run xubuntu 12.04 alongside a NTFS storage partition and a windows 8 partition. I moved my MySQL data directory off the xubuntu (ext4) partition, onto the NTFS partition, and did an import of a ...
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  • 201
5 votes
2 answers
1k views

Tons of unknown connections in nethogs

I am seeing hundreds of different connections to the same ip and port scrolling by when running nethogs. Occasionally the foreign IP and port will change (not always 80, but sometimes). I've noticed ...
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  • 151
5 votes
0 answers
11k views

Is there a solution for when a system hangs on "switching to clocksource tsc" anyway?

Ok so this is exactly what I did yesterday, and what I have tried to solve the problem so far. The distribution is Ubuntu Server 12.04. What I have done just before the error appeared I added a new ...
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5 votes
4 answers
2k views

Tool to create recipe to preseed partitioning

I want to preseed an Ubuntu 12.04 installer using a custom partitioning recipe. My disk layout is reasonably complex, and so is the recipe syntax itself. Hand-crafting such a recipe seems tedious and ...
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  • 321
5 votes
2 answers
1k views

Jingle CLI client / Jitsi replacement / VOIP

I am looking for a Jingle client for the command line. Currently, I use Jitsi, but my dreams of not needing the GUI for more than just web-browsing are not realized due to my reliance on this program....
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4 votes
0 answers
87 views

execvp: /bin/bash: Argument list too long on Ubuntu 20.04 but OK on Ubuntu 18.04 (all using Windows 10 subsysem)

I bought a new windows 10 PC and installed WSL 2 using (as admin) wsl --install This installed WSL 2 with Ubuntu 20.04 LTS. I then copied my files from the old PC which was using same windows 10 pro ...
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  • 769
4 votes
0 answers
1k views

Grub not trying to unlock LUKS partition

I have Ubuntu 18.04 with full disk encryption with two partitions: EFI ESP and LUKS1 encrypted root partition (no separate /boot). After installing grub and rebooting, it just shows normal grub > ...
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4 votes
0 answers
449 views

Slack desktop sometimes very sluggish and slow

I am using Slack for Linux (Beta) 4.16 on Ubuntu 20.04 and experience very slow and sluggish typing sometimes (not always, hard to reproduce). I have 40GB of RAM and quite a powerful laptop, and it ...
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  • 141
4 votes
1 answer
722 views

curl not able to write to /tmp directory owned by user

I tried running the script as instructed in https://docs.docker.com/engine/security/rootless/: $ curl -fsSL https://get.docker.com/rootless | sh But the script crashed in the following line: curl -L -...
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4 votes
1 answer
2k views

Can't connect to VPN L2TP from Ubuntu 18.04 CLI

I have a VPN that is working when I connect through my windows using L2TP, however when I set up my ubuntu with CLI its not working. I get the following error when I run $ nmcli c up myvpn Error ...
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  • 141
4 votes
0 answers
347 views

Webcam from Windows to Ubuntu via XRDP

Situation: Windows 10 machine with integrated webcam and external USB webcam. Ubuntu 20.04 desktop Connection via xRDP from Windows to Ubuntu (with both webcams being selected under the "local ...
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  • 41
4 votes
1 answer
1k views

WiFi suddenly stopped working on Ubuntu 18

My Situation is exactly equal to OP's from this question (except for the exact hardware configuration; I can add some more details if needed), but the answer that fixed the issue there didn't work for ...
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  • 43
4 votes
0 answers
669 views

WiFi dropping only on Ubuntu

I am having a lot of problems with Wi-fi. The strange thing is that happens only on my Ubuntu 18.04.4 x86_64 (4.15.0-101-generic) computer, all others have Windows and are not affected. What happens ...
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  • 41
4 votes
0 answers
89 views

Why do 5 drives disappear when I scan for them?

I am trying to diagnose why my raid6 array of 20 hard drives stopped working on my ubuntu installation. I noticed that when I tried to force it to start, several drives simply stopped being listed in ...
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4 votes
1 answer
2k views

Bad Request 400 message for apt-get install every time I try to build my Docker Ubuntu 16:04 image

I am attempting to build a docker image with the requirements specified in requirements.txt. However, upon trying to build the file, I get the following error: E: Failed to fetch http://us.archive....
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4 votes
1 answer
409 views

How to make Folding@Home run when idle?

I've installed and configured Folding@Home: $ lsb_release --all No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 19.10 Release: 19.10 Codename: eoan $ FAHClient --...
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  • 47.2k
4 votes
0 answers
2k views

Why are the permissions of /run/user/1000 wrong

My /run/user/1000 directory is owned by root - as far as I understand it, it should be owned by my user - I'm unable to start any snap programs (e.g., slack) as I get this error: mkdir: cannot create ...
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