Impossible de switch user from lock screen on GDM3 18.04

[Michel-Ekimia]

This happen on a specific install, not reproductible on a new install.

-> Lock the screen from user 'oem'

-> click 'login as a different user'

-> Screen flickers but login screen never appear

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.3-0ubuntu18.04.4
Uname: Linux 4.18.5-041805-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 23 09:22:47 2019
InstallationDate: Installed on 2018-03-06 (534 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: Upgraded to bionic on 2018-06-12 (436 days ago)
mtime.conffile..etc.gdm3.custom.conf: 2019-01-20T18:40:54.962138

[Sebastien Bacher (seb128)]

Thank you for your bug report. Could you add your 'journalctl -b 0' log after getting the issue?

[Michel-Ekimia (michel.ekimia)]

Sorry for the lag , here is a log were the screen does not go back to gdm , doing CTRL+ALT+F1 and log onto the new user works

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Christian Stötzer (cstoetzer)]

Hey.

I ran into the same problem but with Ubuntu 20.04 (arm64) on the raspberry pi 4.

Disabling Wayland fixed it, since then I don't see any artifacts when starting gnome.

[Daniel van Vugt (vanvugt)]

Christian,

I'm not sure that's exactly the same as this bug since this bug is about "flicker" and failure to log in, while you refer to "artifacts". It's probably best if you report a new bug for that by running:

  ubuntu-bug gnome-shell