debcrafters-packages team mailing list archive

[Daniel van Vugt <2121017@xxxxxxxxxxxxxxxxxx>]

Eugene, the GDM source also says you may need to create user 'gdm-
greeter-2'...

https://gitlab.gnome.org/GNOME/gdm/-/blob/main/daemon/gdm-dynamic-user-
store.c?ref_type=heads#L809

You should ignore all the threads blocked in poll() because that's the
normal state of most threads.

Fred, thanks for confirming the fix. This seems like a case of GDM
making unreasonable assumptions, failing to support systems whose
/etc/nsswitch.conf has not been updated in several years. Also failing
to support machines where the user might have customised
/etc/nsswitch.conf. All are valid configurations that should not prevent
you from having a login screen.

The regression was only introduced recently in:
https://gitlab.gnome.org/GNOME/gdm/-/commit/beb16b4746856ebd5b3fd9693775757a06a7bb48


** Changed in: gdm3 (Ubuntu)
       Status: Confirmed => Triaged

** No longer affects: apparmor (Ubuntu)

** No longer affects: gnome-session (Ubuntu)

** No longer affects: pam (Ubuntu)

** Summary changed:

- Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)]
+ Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)] on systems installed before 2024

** Summary changed:

- Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)] on systems installed before 2024
+ 25.10's gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)] on systems installed before 2024

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to pam in Ubuntu.
https://bugs.launchpad.net/bugs/2121017

Title:
  25.10's gdm3 doesn't start [unix_chkpwd: could not obtain user info
  (gdm-greeter)] on systems installed before 2024

Status in gdm3 package in Ubuntu:
  Triaged

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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