From the usual Ubuntu login screen, I click on my name, type my password, and press ENTER. Screen goes black...and stays black. I cannot get to my desktop.
If I SSH from another computer and run htop, I can see
/usr/bin/gnome-shell is eating up 100% of a single core. Other than gnome-shell, the system is completely idle. Load average in htop is exactly 1.00.
Earlier today I left it there for over an hour, but no change. Since then I've also tried rebooting, but same results. This desktop was previously working fine, not sure what I messed up. How can I debug what is happening?