Dell XPS 13 7390 with Ubuntu, purchased from Dell in December 2019.
It was working great until today when Firefox disappeared. After I closed Firefox I couldn’t start it again. It just wasn’t there (at least search in GUI and terminal couldn’t find it). So I went for lunch and when I got back it wouldn’t let me sign in (password wasn’t accepting any characters), so I pushed power button to turn it off.
Turned it on and it boots to command prompt instead of GUI.
sudo systemcd set-default grpahical.target
It loads desktop background and that is all.
Any suggestions how to resolve this?