sudo apt-get update
sudo apt-get upgrade #see if the package is held back
sudo apt-get purge gnome-session gnome-desktop
sudo apt-get install gnome-session gnome-desktop
17 Mai 2015
sudo apt-get update
sudo apt-get upgrade #see if the package is held back
sudo apt-get purge gnome-session gnome-desktop
sudo apt-get install gnome-session gnome-desktop