Possible Duplicate:
Unity doesn’t load, no Launcher, no Dash appears
Ive installed gnome 3 and gnome3 session . When i login to gnome 3 , it shows gnome 3 panels and my mouse but when i click the menu , nothing happens , it just hang over there . So i decided to remove both package , after removing , i login into my Unity interface and found out that i displays my mouse but nothing else , just black screen/blank screen with mouse . how can i fix this?