Comment 16 for bug 830404

(If you wish, you can test it in virtual machine):
get a Xubuntu / Lubuntu 12.04 Beta 2 installation CD ISO image (it doesn't contain Unity, KDE 4, GNOME 3 or other desktop environments you may don't like);
install it;
sudo apt-get install gnome-session-fallback
select "GNOME Classic (no effects)" session at the login screen;
panel context menus can be accessed by <Alt> + <Mouse Right Click>;
(do you need something more?)