I have my Ubuntu 18.10 just installed on my SSD and somehow I broke the desktop.
I was trying to change the login screen color following this forum: How can I change the purple background color of the lock screen on Ubuntu 17.10? and replaced the original gdm3.css in /etc/alternatives/ with its backup after the modification failed. Since then it locked me out. Every time I log in it flashes my wallpaper and crashes/bounces back to the login screen. I tried to reset GNOME settings but it didn't work for me.
But going to console mode with Ctrl + Alt + F1 (or F2, F3 etc) then type startx it loaded the original GNOME desktop just fine.
Can somebody explain this?
