It wasnt possible to build the .deb packages from fglrx 12.1 within Ubuntu 12.04. Now with fglrx 12.2 it was possible, so I installed the driver, but it totally fucked my system.

I can only log into Unity 2D but it crashes and i do not have ANY Shell to interact with. I started a terminal with ctrl+alt+t and started Firefox in it...
Moving Windows is terribly slow...
My xorg.conf is identical(I created a new one via aticonfig --initial after driver installation) to the one I had with the fglrx version supported by Ubuntu.
Anyone here, who can help me?