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[Bug 2122294] Re: gnome-session-init-worker crashes with SIGTRAP (Failed to start unit gnome-session-x11@gnome-login.target: ...: Unit gnome-session-x11@gnome-login.target not found.)

 

> But what is doing the asking?

My best guess is a config in /etc/gdm3/custom.conf
How that may have happened is that if mhalano had modified /etc/gdm3/custom.conf prior to the update they would have got a merge conflict on pkg upgrade and possibly resolved that incorrectly. They stated:

> I also will edit /etc/gdm3/custom.conf and edit to comment that line.
> IIRC I got the error and then I edit it because I thought X11 was being called and then I should force Wayland, even it was the default.

so we're not seeing the configuration that was in-place for this
behaviour to happen.

I patched gdm to not accept a broken displayserver configuration
anymore.

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https://bugs.launchpad.net/bugs/2122294

Title:
  gnome-session-init-worker crashes with SIGTRAP (Failed to start unit
  gnome-session-x11@gnome-login.target: ...: Unit gnome-
  session-x11@gnome-login.target not found.)

Status in gdm3 package in Ubuntu:
  Fix Released
Status in gnome-session package in Ubuntu:
  Won't Fix

Bug description:
  I restarted my machine today, and it was odd how long took to GDM appears. For some reason it seems it was in a crash loop. Normally after the boot it appears turning on my external display, and than appears the GDM. But this time it entered in a loop turning on and off my external display.
  I can say that because appears an OSD written "HDMI 2" when it turns on the display.
  I hope the logs can give you more details about it.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: gdm3 49~rc-0ubuntu1
  ProcVersionSignature: Ubuntu 6.17.0-3.3-generic 6.17.0-rc3
  Uname: Linux 6.17.0-3-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.33.1-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Sep  7 14:45:45 2025
  InstallationDate: Installed on 2021-11-26 (1381 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  SourcePackage: gdm3
  UpgradeStatus: Upgraded to questing on 2025-08-25 (13 days ago)
  mtime.conffile..etc.gdm3.custom.conf: 2025-09-07T13:52:05.225338

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