Questions tagged [debug]

Debugging is a methodical process of finding and reducing the number of bugs, or defects, in a computer program

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debugging Cuda on Ubuntu 22.04 takes a long time, hangs on step over, VSCode

It is totally unusable. I have to go back to Windows. What are some probable causes and how do I investigate?
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1 answer
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Where can I find debug symbols for KDE Discover

I am trying to provide a backtrace for repeated crashes of KDE Discover, but cannot find (much less install) the needed debug files. I have attempted to find debugging symbols for Discover by adding ...
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How to install OpenJDK-19 debug symbols on Ubuntu 20.04?

I've installed OpenJDK-19 on Ubuntu 20.04 using snap. However, I'm not able to find the package in snap which corresponds to openjdk-19-dbg in apt, and I can't find OpenJDK-19 in apt at all. Could you ...
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1 answer
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Unable to find /usr/lib/debug/modules/...vmlinux file for debugging dump file with crash utility

I need to debug a vmcore dump file using crash utility, but i don't see a debug vmlinux in my /usr/lib/debug/modules/ path. Actually in my system, the modules directory is not present under /usr/lib/...
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Open rgb don't work correctly?

Since yesterday my computer no longer works properly with open RGB, I am not even able to turn it off, I have Ubuntu 22.04 LTS. Just to find out if this has happened to other people. Thank you and ...
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70 views

Google chrome only runs in debug mode

Today I updated my Ubuntu distribution to the latest available, from 20.04 to 22.04. During this update, everything went great, but at the time that I opened chrome browser, I noticed that this is a ...
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0 answers
53 views

GNOME - Dock appears on Lock Screen

This glitch only happens with the dash to dock extension (https://extensions.gnome.org/extension/307/dash-to-dock/) and not the default Ubuntu docks or any other docks I've tried. So, when I use the ...
1 vote
0 answers
43 views

Unable to get Gnu C Library debug symbols

I have two machines. One is Intel x86_64, the other is aarch64 (although I doubt the architecture variation is the problem). Both are Ubuntu. I compile the same program on each of the machines, with ...
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109 views

Need to debug postfix service for slow bootup

I had slow bootup recently and found using systemd-analyze that postfix-service is taking almost 25 s to start, critical-chain told me it was specifically postfix@-service. PS: I also do not know what ...
-1 votes
1 answer
54 views

Source for ccnet-dbg and libccnet-dbg

I am trying to install SeaFile server on Lubuntu 20.04.3. So that I can report any errors, I ran the command in the documentation and tried to install ccnet-dbg and libccnet-dbg. I got the error "...
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A debbuger that doesnot use ptrace()

Using strace or gdb i get this root@localhost:~# strace ls [Pid 2158] Unsupported ptrace request number 16902, tracee pid = 2159. [Pid 2158] Unsupported ptrace request number 16896, tracee pid = ...
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2 votes
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163 views

How to disable the splash screen on Ubuntu 20.04 on shutdown (not on power on)

I want to turn off the splash screen when shutting down, but I can't find anything that talks about disabling the splash screen when shutting down. Does anybody know how I can achieve this?
3 votes
1 answer
374 views

Compiling the source code creates bigger files comparing w/ Ubuntu prebuilt packages, why?

Am I doing anything wrong? I'm building some libraries from the source code, but the file sizes are much much bigger comparing w/ Ubuntu packages. Here is an example. https://github.com/linuxwacom/...
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1 answer
59 views

How to trouble shoot arbitrary Linux programs

Currently I am trying to become better at using Linux and therefore I would like to know how Linux experts troubleshoot arbitrary programs. On my new laptop I could not burn a cd via k3b. It just got ...
1 vote
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175 views

Weird hibernation behavior with systemctl hibernate

I've followed this tutorial to enable hibernation on my ubuntu device: Anthony O.'s answer to Hibernate and resume from a swap file When I hibernate using sudo s2disk, everything works fine and there ...
1 vote
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380 views

Ubuntu Desktop 20.04 sudden random turn off

I'm on Ubuntu Desktop 20.04 with a LENOVO ThinkPad L13 Yoga. Since a few days ago, Ubuntu randomly suddenly turns off. No Shut down just an immediate turn off. It looks like a power loss. It sometimes ...
4 votes
1 answer
1k views

Kubuntu: Using Wayland / Nvidia / KDE on 21.04

I've just updated Kubuntu from 20.10 to 21.04. When trying to start a new session with Wayland it freezes at the vendor splash screen. How would I go about it to debug this? Suspecting it might has to ...
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3 votes
2 answers
1k views

What is wrong with ddebs.ubuntu.com

Did something expire that should not have? I am using debug symbols on my Ubuntu 20.10 install, and now I get this when I run the apt-get update command. W: An error occurred during the signature ...
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1 vote
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touchpad stops working intermittently, help discovering packeg or kernal issue to troubleshoot or file bug report

So, New thinkpad T14s AMD, Kubuntu 20.10. the touchpad will sometimes stop working. Sometimes I turn on the laptop and the touchpad works, other times no. The output of "cat /proc/bus/input/...
6 votes
1 answer
586 views

Missing fonts cause LibreOffice Impress to mess up the layout of the slides

I have reported a LibreOffice Impress bug here. In that bug, the text of a slide went beyond the page margin Although it looked fine in Microsoft PowerPoint Now I cannot reproduce the bug anymore. ...
2 votes
0 answers
113 views

Ubuntu preset the letter ‘e’ to all entries I make

I am a new Ubuntu user. I have an odd problem, namely that the letter ‘e’ is added to the beginning of all entries I make. I recently added a keyboard short cut (ctrl + f) but following the problem ...
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4 votes
2 answers
4k views

Trying to install KDbg debugger

I'm trying to install KDbg debugger to use while I code in C and have some problems in figuring out what to do. As suggested in this other similar question: How to install software provided in ...
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1 answer
1k views

Update to 20.04 VSCode debugger "Attach by Process ID" do not see process

I updated Ubuntu to 20.04, after this VSCode debugger "Attach by Process ID" do not see processes run with nodejs. I tried reinstall other versions from Ubuntu Software, and also from website, but it ...
1 vote
0 answers
124 views

19.10: `curecoin-qt` wallet installation fails on the last two steps

In order to make the most of the Folding@Home project (https://foldingathome.org/covid19/) and fight COVID-19 from our homelabs — tokenwise — I've tried to install the curecoin-qt wallet (https://...
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900 views

FAHClient cannot connect on Ubuntu 19.10

I've been running FAHClient successfully for one day now, and hence been contributing to the protein folding project. ... Well, I was until I recently booted my system. Now, the client won't connect, ...
1 vote
1 answer
444 views

How to serve ddeb files with reprepro?

I maintain our internal apt repo of Ceph, its build script generations some ddeb files, which is the debug symbol file. But reprepro cannot add those ddeb files, with errors like: Unknown file type:...
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1 vote
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computer goes back to sleep after a few seconds without any error message

I encounter a problem with my ubuntu 19.10 with gnome install on a laptop(razor blade from 2017). As quite unexperienced with the linux architecture, I failed fixing it by myself; the main reason ...
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2 votes
0 answers
1k views

Unable to find debug symbols for Ubuntu 18.04 Kernel 5.4.13

I am trying to get the debug symbols for Ubuntu 18.04 bionic, kernel 5.4.13. I followed the below steps: uname -r # 5.4.13 uname -v # #1 SMP Sun Jan 26 17:18:26 UTC 2020 ...
1 vote
1 answer
669 views

Is Ubuntu LTS running a DEBUG kernel?

I found this in my system log: [ 14.845195] ********************************************************** [ 14.845196] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** [ 14.845196] ** ...
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2 votes
1 answer
698 views

dynamic debug permission issue (k5.0.0)

When I attempt to read or modify the kernel dynamic_debug settings, I encounter a permissions issue. root@roberto:/sys/kernel/debug/dynamic_debug# cat control cat: control: Operation not permitted I'...
2 votes
0 answers
3k views

How to enable IPTABLES tracing on ubuntu 18.04 server

Ive found this simple straightforward way to trace what Iptables is doing on my kubernetes/calico cluster https://www.opsist.com/blog/2015/08/11/how-do-i-see-what-iptables-is-doing.html Nor ipt_LOG, ...
1 vote
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100 views

My session automatically closes when starting a certain type of App

I am new to Ubuntu. I just did an install of Ubuntu alongside Windows. Everything works perfectly except for one thing: Ubuntu crashes. It's not a regular event, but it happens when I open ...
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5 votes
2 answers
712 views

Where are the debug symbols for plasmashell (Kubuntu 19.04)?

I'm having an issue with plasmashell crashing anytime I leave the computer alone for more than an hour or two. I've tried installing debugging symbols to generate a useful crash report, but keep ...
1 vote
0 answers
3k views

How to solve warnings from GDB?

I need help about debugging GIMP 2.10.10 O.S. Ubuntu 18.04.2 LTS GDB Version (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git I get this message from GDB when i try to generate a backtrace inside flatpak ...
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438 views

Reset debug/verbose mode logging in bash script

I use a cronjob as root to check via lsof if some remote machines have established an ssh tunnel to the main server (root, otherwise lsof and netstat won't show the username and sshd pid). Then for ...
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2 votes
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Stop the "System program problem detected." pop-up without disabling error reporting

everytime I login on my computer, a pop-up appear containing: System program problem detected. And no further informations, I mean I don't have any clues on what's wrong I can just report it or ...
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3 votes
0 answers
867 views

PlayOnLinux: Microsoft Office 2013 Please wait while the virtual drive is being created

I recently faced a bug while trying to install Microsoft Office 2013 though PlayOnLinux on Ubuntu 18.04. The installation did a kind of infinite loop during the following step: Please wait while ...
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1 vote
2 answers
4k views

Ubuntu 18.04 on Acer Spin 5 with \EFI\BOOT\mmx64.efi not found

I attempted to reinstall Ubuntu 18.04.1 on my Acer Spin 5. Installation appeared to go fine, but then when I restarted: Failed to open \EFI\BOOT\mmx64.efi - Not Found Failed to load image \EFI\BOOT\...
1 vote
2 answers
4k views

Slack 3.3.3 crash on Ubuntu 18.10

I have installed the latest Slack 3.3.3 from the official website. Downloaded the deb package, but when i start it, it simply crash and nothing happens. It was working fine on Ubuntu 18.04. Is there a ...
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0 votes
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368 views

How to troubleshoot application crashes (find a minidump or stacktrace)

I just installed Ubuntu 18.04.1 on a server, and compiled Povray v3.8.0-alpha.9861167+av620. It works nicely with some test scenes, but it seems to have a memory leak when rendering my particular ...
6 votes
1 answer
851 views

Kernel custom building not working due to missing "binary-generic" recipe

I am on Ubuntu 18.04 and I am trying to build my own kernel by this guide and this guide. Unfortunately the command: AUTOBUILD=1 fakeroot debian/rules binary-headers binary-generic binary-perarch ...
2 votes
0 answers
3k views

How to have logs from a Lutris launched game?

I am trying to play fortnite with wine, but I have disconnection issues so I would like to have a closer look at what is happening. I have already tried to launch the launcher exe from the terminal ...
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884 views

How to fix random mouse jumping?

For some reason, a couple days ago my Ubuntu 16.04 partition started acting up. When I am typing or moving the mouse or clicking the mouse, every few seconds the mouse will randomly jump and click ...
2 votes
1 answer
326 views

Which packages to install to get debugging symbols for Xorg server

Sometimes when resuming from suspend, my screen goes black, no input is accepted, and I'm forced to hard reboot. I discovered a core file, so I ran sudo gdb --core=/core which output: Core was ...
1 vote
0 answers
506 views

Gnome shell segfaults - how to debug?

Gnome shell randomly segfaults: gnome-session[1703]: gnome-session-binary[1703] WARNING: Application 'org.gnome.Shell.desktop' killed by signal 11 I'm guessing it's some extensions' fault but i ...
1 vote
1 answer
820 views

Why does dynamic debug control not print any variables?

I have checked the outputs of dynamic debug functions (more specifically netdev_dbg) in sys/kernel/debug/dynamic_debug/control file. The output has all static characters in formatting string (like %d ...
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2 votes
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826 views

"Error: No space left on device" when booting ubuntu

How would I repair the graphical OS from the terminal tty1? I'm given the error: Error: No space left on device. Even though there is enough space. Detailed description of the system: df -h ...
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1 vote
0 answers
235 views

gnome-shell freezing after opening lid/logging in

gnome-shell freezes almost every time I open the lid of my laptop, and once that happens there's nothing to do but to hard reboot from the power button. It also freezes sometimes after logging in ...
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0 votes
1 answer
315 views

Ubuntu 16.04 LTS randomly freezes

just freshly installed Ubuntu on my ASUS Aspire E15. It's alongside a Windows installation. Roughly 10 minutes into my boot (maybe longer), everything will just freeze. I can move the mouse but no ...
1 vote
1 answer
4k views

cannot find - No such file or directory - libusb - Ubuntu 32 & 64 bit

I'm trying to write a program that transfers data to my device. I'm using libusb. I had many problems to install its package in both 32 & 64 bit edition of Ubuntu 16 LTS. Commands for ...