I can also confirm that manually editing nsswitch.conf as follows fixes the issue:
passwd: files systemd sss group: files systemd sss -shadow: files sss +shadow: files systemd sss gshadow: files -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/2121017 Title: gdm3 49~beta doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)] on systems installed before 2024 Status in gdm3 package in Ubuntu: Fix Released Status in systemd package in Ubuntu: New 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
