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 Ubuntu Touch seeded packages, which is subscribed to apparmor 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/2121017/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
