I installed Ubuntu 12.10 on my computer and somewhere between running the updates and installing Unsettings, Cairo, and Ubuntu tweak; the system asks to restart.
After that there is no visual interface, just terminal. It asks me for my login information but without visual interface.
I have reinstalled a couple of times because I was getting a error after running the updates. Last time I got past the error by updating with terminal. It asked me to restart after running cairo and then I have no visual interface again.