Comment 2 for bug 813004

I can't upgrade. When I try the OS fails at login. I get a message asking if I want to do a partial upgrade for various reasons. It reaches the login window. When I click enter or select user name with the cursor, the login screen disappears leaving me on what looks like the desktop background image with no icons, unity panel or anything. I can login with a tty, but I don't know what to do at that point.