Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [troubleshooting]

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

It is a logical, systematic search for the source of a problem so that it can be solved, and so the product or process can be made operational again. Troubleshooting is needed to develop and maintain complex systems where the symptoms of a problem can have many possible causes.

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What is a tainted Linux kernel?

Under certain conditions, the Linux kernel may become tainted. For example, loading a proprietary video driver into the kernel taints the kernel. This condition may be visible in system logs, kernel error messages (oops and panics), and through…
bwDraco
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How to troubleshoot DNS with systemd-resolved?

How would you go about finding the DNS servers used by systemd-resolved, for troubleshooting purposes? Generally I can use dig and test the DNS servers shown in /etc/resolv.conf. (Or windows - ipconfig /all + nslookup). But that approach doesn't…
sourcejedi
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Linux network troubleshooting and debugging

From time to time, Linux and Unix users are faced with various network problems. Many of these problems are presented here and at some other troubleshooting forums, but they are very concrete and contain a lot of additional technical information,…
dr.
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Why is USB not working in Linux when it works in UEFI/BIOS?

For background I have just built a new machine with modern hardware including: AMD FX-8350 Gigabyte GA-990FXA-UD3 motherboard 16GB RAM NVidia GTX 650 Ti Kingston SSD Given that, I tried to install various versions of Linux on the SSD and was met…
BrionS
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Trim with LVM and dm-crypt

I tried to setup TRIM with LVM and dm-crypt on ubuntu 13.04 following this tutorial: http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/ See the notes about my configuration and my testing…
student
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Why do my identically prepared USB sticks differ in one byte?

I have two identical USB sticks (TrekStor 16GB) prepared as following with the c't bankix image. Preparation using GParted: Deleted the existing partition Created a new DOS partition table Formatted the stick with FAT32, primary partition Loaded…
student
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Remote-Accessible Live-Distribution (aka Live CD)

I'm looking for a live distribution (live CD or the likes) which comes - per default - with sshd running at startup. I want to check the components of my laptop whose graphics has died (card-replacement did not do the trick). The system seems to…
Nox
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console-kit-daemon Hogging CPU and RAM

We have a system that's been a bit sluggish. top reports that console-kit-daemon takes anywhere from 18-30% CPU and about 50% memory. There are only two users logged in, one on X and one via ssh. Any ideas how to resolve this? Running Debian. uname…
Michael Todd
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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 curious. I've run systemctl --failed and I get the…
George G.
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Chrony 3.1 refuses to sync with ntp server

I have 70 machine with CentOS 7.2 and chrony version 2.1.1 syncing perfect with my NTP server protocol v3. Recently I added 30 machines with CentOS 7.4 and chrony version 3.1, but these 30 machines refuse to sync, I followed all the troubleshooting…
Jawad Al Shaikh
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Restarting all the network in Ubuntu after hibernating

When my Ubuntu 14.04 machine awakes from hibernation, sometimes the network is disable and enabling it does not make it work again. Running sudo service network-manager restart alone does not solve the problem. But sudo ifconfig wlan0 down && sudo…
Quora Feans
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jetbrains-toolbox loads to a blank screen

For the last month or so, I've been attempting to get jetbrains-toolbox to work. It used to work (and is how I installed IntelliJ IDEA and Gogland.) When I went to update the IDEA I'm currently using Arch. Here are the things I have tried.…
J. Gonzalez
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Suggestions needed to debug why ps -ef gets stuck

A few of my processes consume 100% cpu. I'm trying to figure out which scripts are causing it I tried running strace ps -ef: open("/proc/PID/status", O_RDONLY) = 6 read(6, "Name:\textract\nState:\tR (running)"..., 1023) = 1023 close(6) =…
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How can I track script which gives me "command not found" right after the login?

When I login, I have these messages: -bash: $'\r' : command not found -bash: $'\r' : command not found -bash: $'\r' : command not found It is quite clear that it is caused by Windows-style line endings in some startup script(s), so my question is:…
Denis Sablukov
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Debugging hanging bash process

After some bad performance today, I checked top: 1 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14229 myuser 20 0 8776 5264 1684 R 99 0.2 1383:47 bash 98-100% use by a Bash process which should have died a long…
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