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[Bug 2121017] Re: Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)]

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Daniel van Vugt <2121017@xxxxxxxxxxxxxxxxxx>
Date: Fri, 22 Aug 2025 06:36:52 -0000
Reply-to: Bug 2121017 <2121017@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

I'm guessing that /run/systemd/userdb/org.gnome.DisplayManager missing
just means the 'gdm3' process isn't running.

Please follow the other steps in comment #28.

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https://bugs.launchpad.net/bugs/2121017

Title:
  Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-
  greeter)]

Status in apparmor package in Ubuntu:
  Confirmed
Status in gdm3 package in Ubuntu:
  Confirmed
Status in gnome-session package in Ubuntu:
  Confirmed
Status in pam package in Ubuntu:
  Confirmed

Bug description:
  My system:

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu Questing Quokka (development branch)
  Release:	25.10
  Codename:	questing

  Completely updated.

  After yesterday (2025-08-19) package updates, gdm3 stops on starting
  Ubuntu and It's impossible to start Gnome. Gdm3 freezes computer.

  On restarting computer, I see a lot of dmesg messages:

  nouveau cannot find any crtc or sizes

  I've blacklisted nouveau driver and installed several nvidia drivers
  and nothing works.

  My nvidia is:

  # nvidia-driver-assistant
  Detected GPUs:
    NVIDIA GeForce RTX 4070 Laptop GPU - (pci_id 0x2860)

  Detected system:
    Ubuntu 25.10

  Only works to install lightdm.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: gdm3 49~beta-0ubuntu2
  ProcVersionSignature: Ubuntu 6.16.0-13.13-generic 6.16.0
  Uname: Linux 6.16.0-13-generic x86_64
  ApportVersion: 2.33.1-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Aug 20 08:23:58 2025
  InstallationDate: Installed on 2023-06-17 (795 days ago)
  InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

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