I have ubuntu 12.04.02 and I always uses kde 4.10.1. Sometimes I need to swith to unity or gnome classic (with effects), the problem is that when I log in with one of them I can't access to "settings menu" or other menus because they do not appear. I think I have messed up some time ago but I don't remember. Maybe it is a problem concerned to compiz.
I have tried to use
unity --reset and
rm -rf .gnome .gnome2 .gconf .gconfd .metacity commands to reset gnome2 and unity but still the same thing.
So is there a way to reinstall compiz or gnome classic and unity in order to clean them like when I have installed ubuntu first time? (I just would like to reinstall them without making any change to kde desktop.)