debcrafters-packages team mailing list archive

[Eugene Crosser <2121017@xxxxxxxxxxxxxxxxxx>]

> The GDM source also suggests creating a user account 'gdm-greeter' in
some cases. But please try adding sss to nsswitch.conf first.

Because the error message is "unix_chkpwd[2601]: could not obtain user
info (gdm-greeter)", I tried to create an account "gdm-greeter" and
restart gdm.

Then the error changed to "unix_chkpwd[2601]: could not obtain user info
(gdm-greeter-2)".

I have doubts that this error is what prevents gdm3 from starting...
Related:

>> Another observation: when started under strace, I can see that gdm3 is waiting on a poll on an eventfd.
> Eugene, that should be just the normal Main loop that is polling, nothing weird.

It is not weird that gdm process is waiting in the poll, but it weird
that nothing notifies this eventfd. When started under strace, gdm3
process proceeds to wait in the poll() on a _single_ file descriptor,
that was previously created by eventfd(). And waits indefinitely. So I
guess that is may be a clue that _something_ should have notified the
process that it can go on, but did not...

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to gnome-session in Ubuntu.
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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