Disable Unity!

A very big THANK YOU. My poor old machine was struggling with Unity. Strangely, when I first installed 11.04 it said my system could not run Unity and would use gnome... when the system upgraded to 11.10 a couple of days ago it gave me Unity! Your instructions are great, the only other thing I had to do was set my user account to ask for my password as I'd turned that off as I'm the only person to used this system.