I removed Unity via the Software Store and rebooted.
Now I got the following error:
unable to load session 'ubuntu'
I can't log in as guest either.
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Please open tty (virtual console, text mode only):
sudo apt-get update sudo apt-get install ubuntu-desktop sudo apt-get -f install sudo dpkg-reconfigure ubuntu-desktop sudo reboot
If above does not work, try:
sudo apt-get install gnome-session sudo apt-get install lightdm sudo apt-get install unity-greeter sudo dpkg-reconfigure lightdm