Public bug reported:
Ubuntu version: Ubuntu Desktop 26.04 LTS, amd64
Hardware: GMKtec NucBox G3S, Intel N95, 8 GB RAM
Package versions:
- gdm3 50.1-0ubuntu0.1
- gnome-shell 50.1-0ubuntu1.1
- gnome-session-bin 50.1-0ubuntu0.1
- ubuntu-session 50.1-0ubuntu0.1
- mutter-common 50.1-0ubuntu2.2
Summary:
Automatic login works correctly on a fresh Ubuntu 26.04 installation
with gdm3 50.0-0ubuntu1. After applying the official updates, which
upgrade gdm3 to 50.1-0ubuntu0.1, GDM successfully opens the automatic
user session on tty2 but starts a second greeter on tty1 approximately
60 seconds later. The greeter becomes active and displays a password
prompt even though the automatic user session is still running.
Steps to reproduce:
1. Perform a clean installation of Ubuntu Desktop 26.04.
2. Create the user `godrivercheckin`.
3. Select automatic login in the Ubuntu installer.
4. Reboot and confirm that automatic login works with gdm3 50.0.
5. Run `sudo apt update` and `sudo apt full-upgrade -y`.
6. Reboot.
7. Wait approximately 60 seconds.
Expected result:
The `godrivercheckin` desktop remains active after automatic login, with
no password prompt or additional greeter.
Actual result:
GDM opens the automatic session successfully:
`pam_unix(gdm-autologin:session): session opened for user
godrivercheckin`
Approximately 60 seconds later, GDM opens another session:
`pam_unix(gdm-launch-environment:session): session opened for user gdm-
greeter`
Session state while the problem is visible:
- `godrivercheckin` user session is running on `seat0`, `tty2`, Wayland.
- `gdm-greeter` is running on `seat0`, `tty1`, Wayland.
- `tty1` is active.
- The `godrivercheckin` session remains online but inactive.
Pressing Ctrl+Alt+F2 immediately reveals the correctly running
automatically logged-in desktop.
This happens on a clean installation before installing Chromium, kiosk
scripts, custom sessions, GNOME extensions, branding or third-party
packages.
The regression appears between:
- Working: gdm3 50.0-0ubuntu1
- Broken: gdm3 50.1-0ubuntu0.1
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: gdm3 50.1-0ubuntu0.1
ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 30 19:56:55 2026
InstallationDate: Installed on 2026-07-30 (0 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2026-07-30T18:37:02.848358
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2162542
Title:
[Regression] gdm3 50.1 starts a greeter about 60 seconds after
successful automatic login
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