After a new installation of 12.10 on a Lenovo x120e and a restart the Unity shell won't launch.
Installation of 12.10 amd64 yesterday went well. I turned the computer off for the night and when I turned it on this morning I was presented with the login screen. When I enter the password the screen flashes black and returns to the login screen. I'm using the right password because if I enter an incorrect one a message in red font tells me so and the login screen remains.
If I choose guest access the computer brings me to the desktop but without the unity shell. A right click will bring up the New Folder, Change Desktop, etc. menu. Ctrl-Alt-T will open terminal. I tried "sudo xinit --:1" but I can't use sudo on a guest account.