Questions tagged [troubleshooting]

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

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21
votes
3answers
9k views

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 ...
82
votes
3answers
108k views

Linux network troubleshooting and debugging

From time to time Linux and Unix users faced with various network problems. Many of these problems are presented here and at some others troubleshooting forums, but they are very concrete and contains ...
31
votes
8answers
124k views

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 ...
1
vote
1answer
14k views

Troubleshooting advice for: -bash: cannot execute binary file: Exec format error

I have a mining rig and am trying to run a program ./garlicoind but I get this error: -bash: ./garicoind: cannot execute binary file: Exec format error Is this a common problem? What does it ...
53
votes
2answers
47k views

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 - ...
6
votes
2answers
9k views

Why can I not see some files in my USB stick on Windows that I can see on Linux?

I'm having a little problem with my USB stick. There are files and folders on the USB stick I can see and manipulate on my Linux machine (Fedora 20) but some of those files and folders appear nowhere ...
8
votes
3answers
4k views

Best practise to diagnose problems [closed]

As Linux/Unix users, we run into problems frequently. And after long hours of problem solving, we develop the skill of debugging. Now, what are good principles, methods or best practises when trying ...
10
votes
2answers
16k views

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 ...
7
votes
2answers
3k views

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 ...
5
votes
2answers
3k views

User data in evince and cups

Some days ago my evince stopped printing. After reinstalling it and trying different versions without success I figured out that it works from other user accounts on the same box. So which files ...
4
votes
0answers
2k views

How to figure out why Linux crashes

Every so often, my laptop will crash. The screen will freeze, including the cursor, the lock lights (caps lock and the like) will turn off if they were on, though my battery, power, and wifi lights ...
0
votes
0answers
156 views

How to find logs about Touchpad malfunction in Debian on Wayland?

I am trying to troubleshoot why my touchpad does not work anymore with Debian on Wayland (after pressing FN9 and FN8), continuing from the thread Why lost communication to Touchpad on Wayland Debian ...
2
votes
0answers
673 views

xrandr doesn't list display port

My laptop (Thinkpad W530) has a VGA and a mini DP port (OR a DP port via docking station). Ubuntu 18.04, xrandr in particular doesn't seem to recognize the DP. For example if I run xrandr gives me ...
2
votes
0answers
45 views

Bookmarks' suggestions are too slow in Firefox

After re-installing Firefox on my Linux Mint system I have been experiencing some trouble with my bookmarks; namely, when I start typing in the URL bar (the main bar in Firefox, the one on the left ...
1
vote
2answers
1k views

traceroute / mtr from multiple locations, How can we do it ? (Or alternate way)

I have a website, recently due to some network issue, Most of my customers are reporting slow loading time of my website. When I reported this to my DataCenter, they are asking me to send the ping / ...
1
vote
1answer
374 views

How to troubleshoot SELinux issues?

I suspect I have a problem in SELinux configuration: my issue goes away after disabling selinux using setenforce 0. I am using the default policy without any modifications. How can I pinpoint the ...
1
vote
1answer
438 views

Accidentally set /lib permissions to 644

Long story short, I've got an Ubuntu server box that was recently compromised (I believe through a known exploit of an older version of Tomcat, which has already been updated). Part of the exploit ...
1
vote
3answers
4k views

Troubleshoot SSH connection problem

I am looking for tips on how to troubleshoot a problem with connecting to a new server via SSH. I am trying to connect using private-key authentication, where SSH uses my local private key to ...
1
vote
1answer
355 views

Dual Boot Mint Linux cursor freezes on F541N (aka X541NA)- how to fix?

Bought ASUS VivoBook Max- F541N with pre-installed Win 10 few days ago and dual booted into Mint Linux Sylvia (Cinnamon) 18.3 successfully I see that the keyboard cursor (touchpad) pointer and ...
0
votes
3answers
811 views

Upgrade from fedora 25 to 27 - Conflict issue

I tried to upgrade from fedora 25 to fedora 27. When running sudo dnf system-upgrade download --releasever=27 --allowerasing I encountered a transaction check error regarding python. The error ...
0
votes
1answer
366 views

Can't complete upgrade from fedora 25 to fedora 26

I tried to upgrade from fedora 25 to fedora 26. I followed the following commands, as explained in the journal sudo dnf upgrade --refresh sudo dnf install dnf-plugin-system-upgrade sudo dnf system-...