Cannot login

[henrym]

I had to Timeshift my computer. Now I cannot login. When I type in the password, it goes black, shows the NVIDIA splash screen, and then goes back to the login screen.
Can I fix this without a complete OS reinstall? I can wipe the drive and reinstall the OS without losing any important files, but I want to fix it if I can.
I am sure that I entered the correct password.

[rene]

The usual referral for login loop is viewtopic.php?p=1769597#p1769597

I'll add that if you use home-directory encryption and changed your user password since that Timeshift snapshot was created that you'll want to with (as your user from that text console) passwd set it back to what it was at the time of that snapshot.

[henrym]

The root partition is full. The thread at the link tells me how to discover that, but how do I fix it.

[henrym]

I ran "ls -alh"
I do not see a directory in / taking too much space.

[rene]

Usually it's too many Timeshift snapshots. Confirm large size of /timeshift with sudo du -sh /timeshift. If large, delete selectively in /timeshift or just blow them all away with sudo rm -r /timeshift/*. Once back in limit number of snapshots and/or move them elsewhere.

If not /timeshift it's supposedly flatpaks; flatpak list and selectively flatpak uninstall <app-id as shown in list> followed by flatpak uninstall --unused, or unselectively flatpak uninstall --all.

sudo apt-get clean doesn't hurt.

If still not it tends to be out of control logging to some file in /var/log; you'd need to look there and see what's going berserk to make it stop.

[oligalma]

If you can't login in graphical interface, you can login in TTY, which allows you to fix the issue. When you get to the login screen press Ctrl + Alt + F1 (if this doesn't work, you can try with F2, F3...)