When I updated to 11.04 I changed the desktop to Gnome, now with the new 12.04 I'd like to switch back to Unity. How do I do this? Thanks!
Well... I guess this is a problem a lot of people is experiencing.
In my own case, I had customized compiz settings previous to the upgrade. And after upgrading from 11.10 to 12.04 compiz started to fail... hence no Unity, no launcher, no menu, no window frames... etc.
I assumed it was because of some personal compiz settings (although not sure which exact settings cause this), since I could login to the Guest account without problems, and there everything worked as expected.
So, I thought the only way to solve this was to reset compiz settings to defaults.
I believe this has already been asked. How can I switch between gnome-shell and unity without logging off?
Open a terminal and type: