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I am experiencing a persistent login loop issue on my Ubuntu 22.04 machine. Every time I attempt to log in, the screen blacks out briefly and then returns to the login screen.

Before the issue happened, I tried changing the keyring's login password to the same as before. I did this because it kept asking me for the keyring password when opening the browser or a few other programs. (It was a recommended fix I read somewhere else). But I don't think this is the issue after much troubleshooting.

Note: I have encrypted SSD and fingerprint reader.

I can still access the terminal through Ctrl + Alt + F3. Here is the list of things I have tried to fix it

  • Check disk space: I have plenty of disk space on all partitions
  • Reconfigure display manager: sudo dpkg-reconfigure gdm3
  • Reinstall display manager: sudo apt-get install --reinstall gdm3
  • Reinstall Ubuntu desktop: sudo apt-get install --reinstall ubuntu-desktop
  • Creating a new user and logging in with that: sudo adduser test
  • Removed and reinstalled Nvidia drivers (recommended, 525, 530, 535):
sudo apt-get purge nvidia*         # removed old drivers before installing new ones

sudo ubuntu-drivers autoinstall    # installing recommended drivers and restart
sudo apt install nvidia-driver-525 # Installed and tried 525, 530 and 535
sudo apt install nvidia-driver-530
sudo apt install nvidia-driver-535
  • Checking for corrupted files (none showed up):
sudo apt-get install debsums
sudo debsums -c
  • Switching to Ubuntu on Wayland on the login screen
  • Tried this

I wasn't able to paste the relevant /var/log/syslog because of size, so here is a link to it https://pastebin.com/abczYTbN

The status of gdm3

$ sudo service gdm3 status
● gdm.service - GNOME Display Manager
     Loaded: loaded (/lib/systemd/system/gdm.service; static)
     Active: active (running) since Fri 2023-09-29 12:55:33 CEST; 1h 42min ago
    Process: 1382 ExecStartPre=/usr/share/gdm/generate-config (code=exited, status=0/SUCCESS)
   Main PID: 1417 (gdm3)
      Tasks: 3 (limit: 18675)
     Memory: 6.5M
        CPU: 143ms
     CGroup: /system.slice/gdm.service
             └─1417 /usr/sbin/gdm3

Sep 29 12:55:33 user systemd[1]: Starting GNOME Display Manager...
Sep 29 12:55:33 user systemd[1]: Started GNOME Display Manager.
Sep 29 12:55:34 user gdm-launch-environment][1529]: pam_unix(gdm-launch-environment:session): session opened for user gdm(uid=128) by (uid=0)
Sep 29 13:19:50 user gdm-fingerprint][9032]: gkr-pam: no password is available for user
Sep 29 13:19:50 user gdm-fingerprint][9032]: pam_unix(gdm-fingerprint:session): session opened for user user(uid=1000) by (uid=0)
Sep 29 13:19:50 user gdm-fingerprint][9032]: gkr-pam: gnome-keyring-daemon started properly
Sep 29 13:19:52 user gdm3[1417]: Gdm: GdmDisplay: Session never registered, failing
Sep 29 13:19:52 user gdm3[1417]: Gdm: Child process 9032 was already dead.
Sep 29 13:19:52 user gdm3[1417]: Gdm: Unable to kill session worker process
mads10m
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