I just made a cup update, here the list of paquage :
Version for all those paquage changed from 1.5.0-8unbuntu6 to 1.5.0-8ubuntu7.3
After that, X restarted without warning and once logged in, first think I saw was that every menu bar where not merged with title bar anymore and look lot like gnome2. Also, sound don't work anymore.
Nvidia proprietary driver from "additionnals drivers tool" are installed. I will check log later to check if I see any error later.
Edit : Lot of stuff look like gnome 2, windows to browse stuff to upload, right click menu, etc. Default system color change since the're was not the same on terminal (grey background), etc.