I installed XFCE 4 all went well. I could logout and login and change between different desktop environment. However when I shut down my computer and booted it up. I get an error from GNOME 3 that "something went wrong".
Then I tried installing xdm so I could get around this. And then I tried uninstall GNOME 3 with these command:
aptitude purge `dpkg --get-selections | grep gnome | cut -f 1` aptitude -f install aptitude purge `dpkg --get-selections | grep deinstall | cut -f 1` aptitude -f install
They couldn't find any so it couldn't be uninstalled.
Now I don't know what to check. I've looked through this documentation thorough: https://wiki.debian.org/Xfce . Any ideas?