Questions tagged [troubleshooting]

Troubleshooting is a form of problem solving, often applied to repair failed products or processes.

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network services reachability troubleshooting

I have voyage linux on a system. It is running an apache server and an sshd. For some reason, i cannot connect to those services from another machine. There are no error logs that i have been able to ...
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Stuck in emergency mode after cloning my system with clonezilla

I cloned my installation from a 240GB SATA SSD to a 500GB NVMe SSD using Clonezilla. The cloning was completed successfully, except for a failure with initrd (unfortauntely I don't remember the ...
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Can't connect to home server

Let's see if this community of wonderful people can help me: I have a home server (old computer running debian as a server) that I use to host a couple of node web pages, a nextcloud service and an ...
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QEMU stuck keys

My keyboard locks up sometimes when I press CTRL related keyboard combinations, for example CTRL+C, CTRL+V etc. One behaviour is that the "C" key seems to be stuck so it writes "...
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OpenDNS setup help

Tried to setup Opendns, but this time it did not work (in my previous install, it worked just fine, unfortunately my pc crashed and had to re-install my OS), followed the setup guide, unfortunately ...
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Finding the cause: WiFi almost unusable on up-to-date Debian, works fine on old Ubuntu

WiFi on an up to date Debian 11.2 works very badly compared to an old Ubuntu 18.04 on the same hardware and same testing conditions. I'm wondering what would be a sensible way of isolating the cause? ...
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logrotate not compressing files

I'm having issues with logrotate as it does not compress files. We migrated from Centos 7 to Alma linux and since it has not worked. I'm trying to get logrotate to rotate and compress log files from /...
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How to determine why system suspends but fails to resume

How would I go about determining why my Chromebook (Acer CB515-1HT using the SeaBIOS for boot provided by MrChromeBox.) running Linux Mint suspends successfully but does not resume? When it resumes, ...
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Atomic Simulation Environment - GUI appears on one laptop, but not the other

I'm a student at University using MobaXterm to access a supercomputer cluster, which runs off of a standard UNIX BASH CLI. Within this system, and within the lab I am a member of, there is a piece of ...
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Unable to launch Steam on Nvidia 495 driver, 5.4 kernel, Linux Mint 20.3

After a few weeks of not having time for games, today I am unable to launch Steam. I do not remember some bigger change in the system = Linux Mint 20 than upgrading my Mint today from version 20.2 to ...
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Ubuntu on Laptop not detecting wifi adapter

The wifi adapter in my laptop is Realtek RTL8852AE. I am currently dual-booting Windows 11 and Ubuntu 20.04.3 LTS. I've gone through multiple options for what it could be, installed rtw89's repository ...
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What keyboard shortcut did I accidentally press at the login screen that killed the window manager?

Mystery time! I'm using a Thinkpad T450s, running Kubuntu 20.04.3 and KDE Plasma 5.18.5. Today I decided to wipe off my keyboard. To do this I locked the screen, and gently wiped the keys from left to ...
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Random log out of tty1 while typing

I experienced a sudden log out from tty1 where I run the i3 window manager. While typing stuff, the screen went black, and in a matter of seconds I was back to the login screen (I use no login manager)...
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Is there log in arch based linux that record all action done on a desktop?

I have an external usb hdd, that suddenly (could be user mistake) became not accessible.. I want to know what have the user did to make that happen before figure out how to reverse the action. Os ...
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Cheese (Camera) is not working in Ubuntu 20.04 on my Corei7 11th Gen(Lenovo Thinkbook)

My camera was working properly yesterday, but all of sudden it stopped working next day. I can only see the black screen as below: My system details are: I've tried all the other solutions like ...
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How to stop LibreOffice Draw from crashing in Debian Bullseye?

After I upgraded from Debian 10 to 11, LibreOffice Draw 7.0 no longer runs. If I open an existing file, or try to create a new one, it crashes, then immediately tries to pull up a document recovery ...
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Colors become distorted randomly in Linux, not in Windows

Currently running Fedora, but my issue is not exclusively pointed to this distribution! I have been experiencing this issue of my screen colors inverting/distorting from time to time. And this bug is ...
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Replacing a faulty disk in a RAID 5 btrfs filesystem?

I'm running Rockstor with one of my pools using RAID 5 btrfs - which I know is experimental, I don't think that's the issue here. One disk of the four in the pool is faulty, with 20000+ write I/O ...
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Cutting off the value of a variable

I had wrote a simple script with should read a list of URL string from a file into a variable and prepare it for the future processing. Content of the dl.txt file: https://some-url.com/site1 https://...
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Is there anything one can do if traceroute shows issues along the path?

Since few days I cannot reach anymore a site: assist.zoho.com (or assist.zoho.eu). Here the output of traceroute: $ traceroute -I assist.zoho.com traceroute to assist.zoho.com (136.143.191.95), 30 ...
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Troubleshooting extreme boot time on Linux

I am not sure if this is the right place to ask such tech support related questions, but this definitely seems to be a Linux issue or at least regarding the way Linux interacts with my hardware. I ...
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2 votes
1 answer
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Finding root cause of TigerVNC multi-minute pauses via ComCast; why "* * *"

What are some techniques for tracking down root cause(s) of intermittent, sometimes very long delays in TigerVNC sessions? Working remotely via SSH using TigerVNC. Most of the time the screen is ...
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2 answers
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Jupyter seems to connect fine, but I cannot access it in a browser

I'm trying to open Jupyter notebook in a browser. Jupyter seems to have connected just fine: [I 20:38:02.663 NotebookApp] Serving notebooks from local directory: /home/user/.jupyter [I 20:38:02.663 ...
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Peculiar and inconsistent behaviour of compose-key after reboot. How should I troubleshoot?

On my Linux Mint 19.3 - Cinnamon, I have observed that sometimes the compose-key works, sometimes it doesn't. Especially, it stopped working after reboot. Investigating it led me to the conclusions ...
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Wireless Adapter Hardware Not Found on PopOS 20.04

My wireless network was working just today. Then I took my laptop to another location to work which was a 5 minute walk, and then the WIFI adapter was completely not working. The computer did not go ...
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E: package net-tools has no installation candidate

I am unable to apt-get install net-tools; I get the error E: Package net-tools has no installation candidate. Unlike the other similarly named questions, I am using Ubuntu 20.04 and I have not been ...
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4 votes
1 answer
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No Bash Prompt after SSH login to rPI (Pi-Hole)

I have had an rPi serving up pi-hole DNS for some time now. The issue has existed for at this point years. I would like to be able to understand and potentially resolve without rebuild. After an OS ...
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2 answers
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Greenbone/GVM (Kali Linux) scan config error message

I use VirtualBox Kali Linux 2020.4. I recently installed Greenbone Vulnerability Assistant. Whenever I click on Scans > Tasks > New Task, the Scan Config drop down menu is not populated. When I ...
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Audio is garbled - alsa-pcm front:2: snd_pcm_status error: Broken Pipe

Running on Fedora 34, all up-to-date. This is a new install as of a couple weeks ago. Computer is relatively new, on a good SSD, plays on Windows fine even with heavy usage, so this shouldn't be a ...
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hardware diagnosis with debian

I have a i7 8550u SOC thin PC that has started acting up lately. It runs debian 10 (buster). buster backports kernel 5.10.0-0.bpo.5-amd64. The SOC is housed in a thin PC aluminium fanless housing. I ...
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2 votes
2 answers
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Troubleshoot SSH reverse tunnel between server and Raspberry Pi

I have two systems: An Ubuntu 20.04 server on the Internet and a Raspberry Pi 2B (Ubuntu 18.04) in my local LAN (behind a NAT router). I am opening a reverse tunnel from the Raspberry Pi to the server ...
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Can't update anything on Linux Mint 20.1

Every time I try to install updates using the update manager on Linux Mint 20.1 I get the following message : E: grub-pc: installed grub-pc package post-installation script subprocess returned error ...
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Identifying physical memory slots from dmesg ECC error outputs

I have a machine with 768 GiB of ECC DDR4 ram. One of the modules is flaky and needs replacing: dmesg fills up with entries like: [Mar25 08:07] mce: [Hardware Error]: Machine check events logged [ ...
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xdotool not working with sxhkd?

ctrl + 2 xdotool type Test Message Added the above line to sxhkdrc with no effect. Using different commands works, but for some reason any xdotool command doesn't work... If i run that command in ...
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Dpkg/atop daemon error

Whenever I try to install any package the following error occurs after a small bit of working normal: penguin systemd[1]: atopacct.service: Failed with result 'protocol'. penguin systemd[1]: Failed to ...
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Kali GUI works when reboot but not when startup

Okay so this is driving me crazy. I need help. I have a Kali linux machine set up with VirtualBox which has been working fine until two days ago. Then, it started doing a super weird thing when I log ...
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2 answers
291 views

How to change shell without the command line

Something broke my fish and I have no idea how to fix it so is there a way to change shell to zsh without using the command line
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Fn+keys for volume broken after reinstalling alsa/pulseaudio

I had no sound in a Kubuntu 18.10 installation and run this: apt-get remove --purge alsa-base pulseaudio && apt-get install alsa-base pulseaudio && alsa force-reload After it, ...
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Debugging tactic -- how to know which process is attempting to modify a file?

I have a strange bug where one of the many development tools I'm using is issuing a git reset HEAD in my project, causing me to lose all my work. I'm able to confirm this by checking the git reflog. I ...
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Intel I350 NIC randomly switches off Ethernet ports until system reboot on Ubuntu 20.04

I have a Dell PowerEdge R620 with Ubuntu 20.04 LTS installed. This system features an Intel I350 NIC. This card had 4 Ethernet ports. After boot or when normally running, I can plug an Ethernet cable ...
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1 vote
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rsyslog only forwarding to remote server with logger -n and rsyslogd -n

Having an issue with forwarding rsyslog to a remote server and I can't quite pin it down. I don't think anything is wrong with my rsyslog.conf, seen below. I basically just added the line to forward ...
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2 votes
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110 views

How do I debug this issue about making xrandr permanent?

I'm trying to change my screen resolution at startup using xrandr. Following this answer, I symlinked a script as /etc/X11/Xsession.d/45setoutput. Here's the content of script: #!/usr/bin/env bash ...
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Intermittent sound issue with amplifier in Fedora 32

To start off, I have no experience writing in this community although I have been around on the SE network for a long time now. I hope my etiquette violations will not be too egregious and you will ...
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1 vote
2 answers
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Fix auto screen rotation on Fedora 33 (gnome)

Problem Auto screen rotation used to work flawlessly. When I turned my laptop on its side (or upside down) the screen would turn as well (very handy for tablet mode). Since the last update it doesn't ...
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1 vote
1 answer
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Can't install nvidia-driver-455 (upgrade from 450 version)

I have a Linux Mint 20 Cinnamon Nvidia-based (GTX 1060) system and would like to install the latest Nvidia drivers now when I noticed they're out. However, I can't seem to be able to install it with: ...
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mintsources doesn't work for unknown reason

I was rooted and accidentally run mintsources on my Linux Mint 20 Cinnamon: Traceback (most recent call last): File "/usr/lib/linuxmint/mintSources/mintSources.py", line 1919, in <...
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2 votes
3 answers
821 views

alias using `$1` and fallback default value prints both the param and the fallback value

I want to create an alias that can handle parameters ($1), and can fall back to a default value if a parameter is not provided.  For example, $ alias foo='NUM=${1:-42}; echo $NUM' Invoked without ...
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Chromium suddenly started creating redundant '~' directory inside home directory. How to get rid of it?

A mysterious '~' directory recently appeared inside my home directory (as in ~/~). Inside I found a single hidden directory .confit which contained a single directory chromium. Inside that ~/~/.confit/...
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2 answers
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Ansible shell module not respecting command switch [duplicate]

So I got the following task: - name: "Use echo." shell: echo -e "First Line\n " > "/tmp/{{ ansible_date_time.date }}_test.txt" delegate_to: localhost become: 'no'...
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Very high kernel procces time usage in new, idle server

We've recently installed a new server, which shows very high process usage in the kernel - as seen here with htop: the cores and memory are reserved - so the usage is normal - but I've never seen ...
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