My stable upgrade is not going well. I disabled extensions and did the upgrade, all seemed to go well until I rebooted. I got a blank screen, not even a login/gdm prompt.
So then I restored using Timeshift.
Next I did the same except I put back all the themes to default settings, thinking maybe it was a theme issue. Same blank screen. So then I did a TTY and installed lightdm and enabled it, thinking that gdm was the issue. Reboot, same blank screen, only this time TTY did nothing.
So then I restored using Timeshift
Next I am going to try the same (using gdm) but uninstalling my nvidia proprietary drivers and see if it is a GPU issue. If that doesn't work....I am switching to XFCE with a big to Gnome.