I was having some behavior on my ThinkPad; it was having issues opening some programs. Of course I rebooted it.
However now it will not go back into GDM. I get a text based login, and can log in to get a fully functioning session. Running
sudo systemctl start gdm opens a blank black screen with a blinking cursor. I can type anything here but nothing happens.
The most similar problem I found is this post
I followed all the steps, including uninstalling the proprietary Nvidia drivers. No dice, behavior is the same.
Where should I start looking for the cause here?
swupd diagnose found some hash mismatches in libGL, but running
swupd repair also didn’t change the behavior after rebooting.