Ubuntu hangs on booting with message “started user manager for uid 120” on Xavier

My Xavier suddenly stop booting with this error msg and keep flashing the screen.

I have faced similar issues on my several other Xaviers several times. On a quick around, I do a fresh flash every time this death msg appears but want to know if theres a fix without flashing. Because on Desktop Ubuntu, there’s an option to manually configure through GRUB to fix this issue but there;s no GRUB on L4T. Please help.

I don’t remember where I saw this before, but FYI, UID 120 is the gdm login manager (“Gnome Display Manager”). I do remember that it has been quite some time since this has been mentioned. For any changes I might mention below I suggest you could back up first with a clone. Also, you should mention which L4T release you are using (e.g., “head -n 1 /etc/nv_tegra_release”).

One article mentions disk space (and note the ext4-fs error at the end of your log, and the fsck failure…this is high on the list of likely problems), so if you can log in via serial console or regular console, what do you see from “df -H”?

Also, you should see this in file “/etc/gdm3/custom.conf” (I’m going through some URLs since I don’t remember exactly what caused this in the past, it might be “hit and miss”…mostly my suggestions are probably “miss”):

Also, you might post the content of “/var/log/Xorg.0.log”.