After installing Ubuntu 13.04 64-bit, I installed all the updates, and then I installed the proprietary AMD graphics drivers for my AMD Radeon 7670M 1GB DDR3 graphics card (I have Samsung NP350V5X), but after restart when I login to my account, I can't get to the Unity desktop.
First I tried to install Gnome Shell, but when I tried to boot to that I just got Gnome Fallback (old Gnome 2 style). Next I tried this: Unity does not start in Ubuntu 13.04
dconf reset -f /org/compiz/ unity --reset-icons &disown
The open source graphics driver works OK, but I want better 3D performance, and I can't get that with the open source driver.