I had Ubuntu 11.10 on my Dell laptop with GNOME 3 installed and everything worked like a charm.
I backed up my users' home folders, installed windows and then Ubuntu and GNOME 3 for a dual boot. After restoring my home folder from backup, I discovered that GRUB loads with an old Debian background and very small text. This is a non-issue, but I brought it up because I think it might be relevant to my other problem. Instead of the new Ubuntu login screen, which I had before, I have the GNOME 2 login screen without a user list. I can't seem to find any preferences dialog for the login screen like GNOME used to have either. Any ideas?