I was running Unity in Natty when I tried to activate the Rotate and Cube effects. That broke Unity and I had to restore the Unity original configuration by invoking
gsettings reset com.canonical.Unity.Launcher favorites
I have now got back Unity and re-tweaked it, but something I did in between now gives me the Launcher on the left side when I choose Ubuntu Classic instead of Ubuntu when I log in. I seem to be in a hybrid state where I can get use of both the traditional (gnome 2?) functionality and also Unity.
How can I restore the Ubuntu Classic interface to its original non-hybrid state?