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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gdb won't attach to process

I'm having trouble running a remote gdb becuase the attached process is already being traced. I run: gdbserver localhost:12345 --attach 142 But I'm told process 142 is already traced by process 127 (...
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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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Enabeing debug mode

Hello my name is Mr Bazzar? I have a question about enabling debug mode after requiring yubikey for login after imputing command (sudo touch /var/log/pam_u2f.log) or (sudo nano /etc/pam.d/gdm-...
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do_user_addr_fault on dmesg and logged out from X11 session, unable to handle page fault for address

Sometimes X11 suddenly logging out itself, the journalctl doesn't show anything weird, but dmesg shows this log also today's log shorter copy: [42149.375463] ath: phy0: DMA failed to stop in 10 ms ...
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Ubuntu Studio doesn't load correctly

I used a USB stick to install Ubuntu Studio 20.04 on my Dell Inspiron 15 (with both AMD CPU & AMD Radeon). Ubuntu starts to load correctly, then becomes all pixelated. If I do a safe mode boot, ...
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How to install debuginfo

I'm trying to run hardware-event based sampling on the Intel Vtune Profiler in order to get more information about my microarchitecture when profiling a binary compiled with gcc -g. However I get ...
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610 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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Debugging Ubuntu 18.04.4 LTS failing to boot

We have an Ubuntu 18.04.4 LTS installed on HyperV. The initial installation was of Ubuntu 18 a few days after being released, but it was periodically patched to the latest version. After installing ...
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448 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 ...
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Run debug with sudo permission using qt creator

I want to debug my app at terminal with sudo permission. I tried to change the terminal settings to /usr/bin/xterm -e sudo and /usr/bin/gnome-terminal -x sudo, but it is just open empty terminal and ...
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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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Inactive windows freeze when I try to switch to them Ubuntu 19.10

In my recent Ubuntu install whenever I have any window in the background for too long and try to click on that again after sometimes, it just freezes. I need to click on the icon in the dock to ...
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548 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, ...
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103 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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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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239 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 ...
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257 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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1answer
192 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'...
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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, ...
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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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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 ...
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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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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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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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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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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\...
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2answers
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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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186 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 ...
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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 ...
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921 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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731 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 ...
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1answer
250 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 ...
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369 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 ...
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1answer
344 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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801 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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231 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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1answer
295 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 ...
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1answer
1k 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 ...
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1answer
3k views

Step-by-step booting with systemd

It may be duplicate of someone's question. If so I'm sorry, couldn't find answer. I'm mastering a very specific OS, based on Ubuntu server. I couldn't install OS on this hardware, so I set all system ...
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1answer
797 views

Identify element requesting sound chip to sleep

Since a few months the sound is suddenly stopping on my laptop after some time. My computer is a Toshiba Satellite L755 with a Conexant CX20585 sound chip, running Ubuntu 17.04. I found out that this ...
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1answer
2k views

How one may enable debug/verbose mode during installation of Lubuntu?

Installation hangs on splash screen without indication what happened. Maybe it really working slowly on something and one should wait, maybe it is dead and something should be changed to make ...
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164 views

Interpret verbose output for ssh login

I have an ubuntu virtual machine running within my ubuntu desktop. The desktop is running an OpenSSH server and I am trying to ssh into it with an RSA key from the virtual machine's OpenSSH client. I ...
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1answer
9k views

How do I get rid of /sys/kernel/debug/tracing?

I have two Ubuntu 16.04.1 servers providing DHCP and DNS services on my network. Today, on one of my servers, I discovered a new filesystem mounted at /sys/kernel/debug/tracing. The other server, ...
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2k views

Genymotion no sound after virtualbox update [closed]

I have an old android virtual machine on Genymotion. I use it regularly and I have my apps on it. After a recent virtualbox update the audio had issues. Now I almost can't hear any sound. I can hear ...
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3answers
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bash: set -x logs to file

I have a shell script with set -x to have verbose/debug output: #!/bin/bash set -x command1 command2 ... The output looks like this: + command1 whatever output from command1 + command2 whatever ...
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14.04 update screwed my computer: relocation error everywhere!

I am running Xubuntu in an old PC. When I upgrade I got a few error messages but I didn't payed attention to them (I'm used to such things). Now, I have lot's of bugs. Basically, from what I was ...
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1answer
775 views

how to fix error creating a bootable USB stick of ubuntu-16.04 iso image?

Could you please help me to fix the bug (An uncaught exception was raised: invalid version string 'fn\x81\xe6\xe1\x8b\xef\xa3\xa861\xa6\xef') getting on creating a bootable USB stick of ubuntu 16.04 ...
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1answer
183 views

How do I debug a system crash probably caused by Chrome?

I have an issue on my Dell XPS 13 9343 laptop. I have used 14.04 15.04 and 15.10 on this machine and each one has been a fresh install (deleted the partition and made a new one of a slightly different ...
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37 views

upgraded to 16.04 LTS and everything is lost [duplicate]

everything is lost, my settings, half of my programs even plugins in browsers and their cookies.... also unity doesnt start when booting... after I log into my account I can see only the wallpaper (...
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1answer
2k views

Ubuntu freezes a few minutes after login

I use Ubuntu 15.10 (running from the disk) I run diagnostics and the disk doesn't seem to have any problems nor my drive should have (it and "expensive" bd-r DVD-r drive from a big brand and never had ...