Questions tagged [troubleshooting]

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

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How to log all communication between MTA and relay host?

I am trying to set up nullmailer to use smtp.mail.yahoo.com as relay host for my home desktop computer (Debian buster). My attempts so far have failed, and I want to debug the problem. So far I have ...
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2answers
83 views

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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113 views

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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1answer
36 views

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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1answer
25 views

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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1answer
28 views

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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60 views

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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2answers
63 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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1answer
20 views

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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1answer
17 views

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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20 views

Installed ubuntu-restricted-extras, but still not able to play or listen to anything, mp3s, mp4s, YouTube, etc

Running Ubuntu Netbook Remix 9.04 "Jaunty". This device has never let me play or listen to any format, mp4, mp3, YouTube, etc Recently tried installing ubuntu-restricted-extras to resolve ...
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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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Blackscreen with backlight after suspend (have access to terminal although I cannot see anything)

Every now and then, Ubuntu 20.04 gets a blackscreen after wakeup from suspend. The backlight is on. I can't see anything, but typing ctrl+alt+f3, user/password/enter and touch tmpfile/enter creates a ...
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24 views

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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33 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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0answers
21 views

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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2answers
742 views

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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1answer
3k views

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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1answer
40 views

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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3answers
175 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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1answer
122 views

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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32 views

File package conflict when trying to upgrade distro

I am upgrading from Fedora 30 to 32 and getting a file conflict. How can I resolve this? I ran: sudo dnf system-upgrade download --releasever=32 --allowerasing which failed with Error: Transaction ...
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2answers
34 views

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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28 views

Installation of two Linux distros grub problem

I have 2 OS in my computer , Windows 10 and Linux elementary os. Recently I installed Debian in /dev/sd5 and by mistake I let it install grub again. But I can't boot to Debian because it is not ...
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39 views

How do I troubleshoot my sd card reader?

My card reader doesn't seem to be able to recognise, let alone read, anything any more. lspci -v lists the device: 06:00.0 SD Host controller: O2 Micro, Inc. SD/MMC Card Reader Controller (rev 01) (...
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127 views

WiFi only works after running Antenna Aggregation commnads Pop!OS

I have installed Pop!_OS (home page) on my ASUS ROG Zephyrus S (manufacturer page). Every time I restart my PC, WiFi does not connect automatically until I run following commands (Antenna Aggregation):...
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45 views

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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201 views

neo4j error: org.neo4j.server.CommunityEntryPoint

I'm using Manjaro Linux (VM) for penetration testing practice. I'm trying to get neo4j to work so I can use BloodHound. Installed packages: blackarch/bloodhound 923.66ffed1-1 blackarch/neo4j-...
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1answer
2k views

Ubuntu 20.04 - GNOME DE freezes

Recently, I installed Ubuntu 20.04 on my machine with the following specifications:- Processor: Intel Core i5, 2.30GHz x 4 (four cores) RAM: 8GB Graphics Card: AMD Radeon, 4GB While working on the ...
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3answers
99 views

Replacing old SATA cables. Could the old ones be cause of dmesg errors on HDDs?

Background When I assembled one of my servers with brand new disks WD Red 3TB, I have possibly made grave error in judgement, which was to use one older and one really old SATA (wikipedia) cables. My ...
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2answers
47 views

How can I scan/test/explore if my Firefox (profile) has been infected?

I use Debian and because of that the version in the reps is outdated, so I have Firefox Quantum that is fully unpacked in a folder where my non-root user has all permissions to read, write and execute....
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Something is messing up with my keyboard and mouse. How to find what is causing this problem?

OS: Debian GNU/Linux 9 (used as OS of my notebook) The problem: Sometimes following things start to happen. The computer stops adequately reacting on hotkeys, as if one key was already pressed and ...
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1answer
291 views

pandoc error: Permission denied

I'm on Manjaro Linux. I have texlive-most installed. I'm trying to make pdf files from md with pandoc. However, I keep getting Permission denied errors. I've tried using pdflatex and pdfroff. Run ...
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1answer
104 views

When creating a LiveUSB, write to the partition (/dev/sdb1) or to the device (/dev/sdb)?

How should I write the img or iso to a pen drive? I'm trying several combinations, but fail to boot and I'm not sure the problem is in the writing to the pen drive, so I want to discard this ...
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1answer
3k views

Display manager not working, Debian 10 boots into tty1

The result of running startx shown below: I’ve installed and used Debian 10 for a couple days now with no problems. Last night I began setting up vim, I downloaded a plugin manager as well as git. ...
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1answer
980 views

How to install zenmap on Fedora

I'm trying to install Zenmap after installing Nmap however it's not quite working. I tried just the regular terminal command dnf install zenmap however it tells me that they're unable to find a match. ...
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35 views

Where can I find my lost mount data?

I am using a cloud platform to store some data. I usually access this through the terminal, and I mount my data with mount /dev/vdc mydata. For some reason, when I did this recently, I got the ...
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1answer
175 views

In Arch, web browsers crash when opening file finder dialogue window

I recently update my Arch, and I am currently running kernel version 5.6.6-arch1-1. When I try to open a file finder window either from Firefox or from Chrome (e.g. uploading an email attachment), ...
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0answers
184 views

Troubleshooting boot issues

Server was running on Centos7 and it suddenly stopped responding. We tried rebooting and it is not able to find any OS to boot. We have tried the following troubleshooting. Tested ram using memtest, ...
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1answer
3k views

Crontab command missing in Fedora 31

Probably a ridiculously simple question, but I cannot find a thing on this online. I am using vagrant boxes for several tests and in this particular case it is the Fedora 31 box from Bento with ...
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1answer
137 views

`ls -d */` is not working on one specific directory [duplicate]

ls -d */ runs fine in all other directories that I tried, but in one specifically, I get this: ls: invalid option -- '/' Try 'ls --help' for more information. I pasted the command in the terminal, ...
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1answer
36 views

How do I troubleshoot a process that kills GNOME Shell?

Whenever I killall evolution and occasionally when I use the GUI to quit, I am kicked out of my GNOME Shell session and have to log in again. I obviously want to determine the cause but I don't know ...
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2answers
970 views

Virtualbox Linux Mint boot black screen with blinking line

I'm trying to install Linux Mint (Cinnamon) in VirtualBox. I have set up the machine and .iso, but when it boots it just shows a black screen with a blinking horizontal line. I had a similar issue ...
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1answer
40 views

Certain applications hanging every few seconds, stops with external monitor

I have an issue on my laptop where the graphical output of certain applications seems to hang every few seconds, but other than graphically hanging the application seems to carry on working, eg, audio ...
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1answer
34 views

Unable to connect to internet on RHEL-7 after botched upgrade

So my situation is, I was previously able to setup network connectivity on my RHEL-7 guest OS (running on host OS Windows 7 using VirtualBox). I messed up an upgrade causing a kernel panic, so I ...
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1answer
76 views

Im having brightness issue and need clarification on a possible fix

Hello i have been using Linux for two years so im still new to the whole community. please forgive me in advanced if this question is stupid and/or in the wrong forum. I have a laptop this ...
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2answers
8k views

Startup Debian 10 error: networking.service loading failed

I've noticed that every time I turn on my PC, there is a line in red. My PC is pretty fast so I don't get to read the problem. I haven't experienced or noticed any problem with my system, but I'm ...
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0answers
65 views

Crash when changing back to tty1

I'm using arch linux with mate-desktop. Whenever I press ctrl+alt+fk, where k=2,...,9 I switch to a tty. However when I want to return I do ctrl+alt+f1which results in a system crash. After that I can'...
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259 views

startx blank screen

This happened after I changed GRUB_CMDLINE_LINUX_DEFAULT="quiet" to GRUB_CMDLINE_LINUX_DEFAULT="" and updating the grub config. After rebooting when I do startx I only get a black screen with a mouse. ...
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1answer
101 views

Launching applications from application launcher with “TZ=UTC” prefixed stopped working

I had a launcher for firefox with command TZ=UTC firefox. Suddenly it stopped working, I think after I did pacman -Syu (I only clicked again much later so it could be something else). I am using arch ...

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