A couple days ago, I rebooted my computer after making changes to my /usr/share/gnome-shell/theme/ubuntu.css file (modifying #lockDialogGroup to customize login screen), and it didn't boot back up. Instead, the boot hangs shortly after loading GDM3 (the screen begins to flash slowly, and the mouse freezes). I managed to boot and login by switching to XDM, but would very much like to return to GDM3.
What I've tried, based on similar questions (GDM3 does not start in Ubuntu 18.04, gdm3 display manager hangs after booting with Ubuntu 18.10):
- Reverting my aforementioned changes to the config file
- Reinstalling GDM3 (which resets that config file, among others)
- Setting WaylandEnable to false in
/etc/gdm3/custom.conf
- Uninstalling all my Nvidia drivers
- Switching to XDM, which worked but is not what I want
- Switching to LightDM, which presented new issues not related to this question
Some of the comments on similar issues suggested this might be a hardware issue (I have a graphics card from the Stone Age, an Nvidia Quadro 600). I'm not sure what role that's playing, however, as I've used this card together with GDM3 for several months now, and issues only presented themselves after messing around with GDM3.
I would like to avoid reinstalling Ubuntu or changing versions, if possible.
I understand this is nearly a duplicate, but given that none of the previous questions have solved my problem, I thought I would seek additional support. Thank you very much!
