Well its ripped off debian with stuff you need for mining. It should be very simple to use but not in my case. Reinstalling didnt help... If somebody could help me with this I would be much thankful.
if you can boot to the terminal, type
if that fails try this
sudo apt-get install ubuntustudio-desktop
or this
sudo apt-get install ubuntustudio-gdm-theme
if all else fails try navigating to the gdm conf file and editing it. or replacing it.