I have looked at the problem a bit closer and things is, lightdm works fine for a while, but eventually it has some kernel package problems:
sep 16 09:09:47 weird-stuff lightdm[1193]: gkr-pam: stashed password to try later in open session sep 16 09:09:47 weird-stuff lightdm[1193]: gkr-pam: stashed password to try later in open session sep 16 09:09:47 weird-stuff lightdm[1193]: pam_unix(lightdm:session): session opened for user attila by (uid=0) sep 16 09:09:47 weird-stuff lightdm[1193]: gkr-pam: gnome-keyring-daemon started properly and unlocked keyring sep 16 09:20:35 weird-stuff systemd[1]: Stopping Light Display Manager... sep 16 09:20:40 weird-stuff lightdm[4045]: Error: can't open /lib/modules/5.4.0-47-generic/updates/dkms sep 16 09:20:40 weird-stuff lightdm[4045]: Error: can't open /lib/modules/5.4.0-47-generic/updates/dkms sep 16 09:20:40 weird-stuff systemd[1]: lightdm.service: Succeeded. sep 16 09:20:40 weird-stuff systemd[1]: Stopped Light Display Manager. sep 16 09:20:40 weird-stuff systemd[1]: Starting Light Display Manager... sep 16 09:20:40 weird-stuff lightdm[4095]: Seat type 'xlocal' is deprecated, use 'type=local' instead sep 16 09:20:40 weird-stuff systemd[1]: Started Light Display Manager. sep 16 09:20:41 weird-stuff lightdm[4118]: Error: can't open /lib/modules/5.4.0-47-generic/updates/dkms sep 16 09:20:41 weird-stuff lightdm[4118]: Error: can't open /lib/modules/5.4.0-47-generic/updates/dkms sep 16 09:20:41 weird-stuff systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE sep 16 09:20:41 weird-stuff systemd[1]: lightdm.service: Failed with result 'exit-code'. sep 16 09:20:41 weird-stuff systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 1. sep 16 09:20:41 weird-stuff systemd[1]: Stopped Light Display Manager. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1655348 Title: gpu-manager Error: can't open /lib/modules/ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1655348/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs