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Message #05850
[Bug 2121017] Re: Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)]
Mainly it seems like the fix for bug 2119541 not working. But that fix
was trivial:
--- a/profiles/apparmor.d/abstractions/nss-systemd
+++ b/profiles/apparmor.d/abstractions/nss-systemd
@@ -25,6 +25,7 @@
@{run}/systemd/userdb/io.systemd.Home rw, # systemd-home dirs
@{run}/systemd/userdb/io.systemd.NameServiceSwitch rw, # UNIX/glibc NSS
@{run}/systemd/userdb/io.systemd.Machine rw, # systemd-machined
+ @{run}/systemd/userdb/org.gnome.DisplayManager rw, # GDM implements a user database for its greeter
@{PROC}/sys/kernel/random/boot_id r,
So please try:
sudo systemctl reload apparmor.service
sudo reboot
(although comment #16 suggests that was already tried) and make sure
this path exists:
ls -l /run/systemd/userdb/org.gnome.DisplayManager
Finally, if you still have the bug then please tell us what you get from
this command:
grep passwd /etc/nsswitch.conf
--
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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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