I have ubuntu 13.04 installed and it goes to the log in screen. When I put the password to log in or try to log in with the guest account, it goes to a black screen where I can only move the mouse cursor. My ubuntu doesn't have the option to chose the Ubuntu 2D. I couldn't find any solution. Anyone knows how can I access it again or how to copy a folder to another partition so I can re install it without losing my work?