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Message #05851
[Bug 2121017] Re: Gdm3 doesn't start [unix_chkpwd: could not obtain user info (gdm-greeter)]
This file does not exist in my system:
cubells@nou:/run/systemd/userdb$ ls -altr /run/systemd/userdb/
total 0
srw-rw-rw- 1 root root 0 d’ag. 22 07:51 io.systemd.DynamicUser
srw-rw-rw- 1 root root 0 d’ag. 22 07:51 io.systemd.Machine
drwxr-xr-x 2 root root 80 d’ag. 22 07:51 .
drwxr-xr-x 26 root root 700 d’ag. 22 07:56
with may system updated completely.
cubells@nou:/run/systemd/userdb$ apt show apparmor
Package: apparmor
Version: 5.0.0~alpha1-0ubuntu4
Priority: standard
Section: admin
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@xxxxxxxxxxxxxxxx>
Original-Maintainer: Debian AppArmor Team <pkg-apparmor-team@xxxxxxxxxxxxxxxxxxxxxxx>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 3.781 kB
Depends: debconf, debconf (>= 0.5) | debconf-2.0, libc6 (>= 2.38)
Suggests: apparmor-profiles-extra, apparmor-utils
Breaks: apparmor-profiles-extra (<< 1.21), fcitx-data (<< 1:4.2.9.1-1ubuntu2), snapd (<< 2.44.3+20.04~)
Replaces: fcitx-data (<< 1:4.2.9.1-1ubuntu2)
Homepage: https://apparmor.net/
Task: cloud-minimal, standard, server-minimal, ubuntu-wsl, lubuntu-desktop-minimal
Download-Size: 744 kB
APT-Manual-Installed: yes
APT-Sources: http://archive.ubuntu.com/ubuntu questing/main amd64 Packages
Description: user-space parser utility for AppArmor
apparmor provides the system initialization scripts needed to use the
AppArmor Mandatory Access Control system, including the AppArmor Parser
which is required to convert AppArmor text profiles into machine-readable
policies that are loaded into the kernel for use with the AppArmor Linux
Security Module.
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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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