Langsung copas aja:
sudo apt-get install gnome-session-fallback
sudo add-apt-repository ppa:jconti/gnome3
sudo apt-get update
sudo apt-get install indicator-applet-complete indicator-applet-appmenu
Setelah selesai install, klik kanan pada panel > Add to Panel > ndicator Applet Appmenu
sumber: http://www.cornext.com/2012/08/activate-global-menu-using-gnome.html