I have previously installed the 'gnome-session-fallback' package to get the standard Gnome desktop instead of unity. I normally just select 'Gnome Classic' when I log in. Just now, I logged in with unity instead just to test it, and now I can't get back to Gnome.
If i select 'Gnome Classic' on the login screen, I get unity instead. 'Gnome Classic (No effects) does launch Gnome instead of unity, but I want the real thing.
How can I have my Gnome desktop back?