I recently upgraded to Ubuntu 12.10 on a relatively old computer. It has a partitioned hard drive (shared with XP). Upon boot, I got a mouse, and a black screen. Also note that when i was upgrading, it said that a Unity plug in does not play nicely with my graphics card. Please help!
i guess your graphic card is just not fast enough for unity (because it is a compiz plugin thus not known as very resource saving)