Ciao from Italy!
Well, the main problem is that, once installed the 12.04.0 from alternate (it goes smooth without any problem), the system is not loaded and it remains only a dark screen: I suppose Xserver freezes there, although I have configurated a formally correct xorg.conf settings for openchrome. I've already learnt how to do with the "nice" Nvidia Riva TNT 2, other unpleasant hardware that I've found on 4 Pcs in our company!! The Xserver log is a precious informations' source about this!
Erick, I've done all the installations with a connected power cable and with a wired connection, so I'm quite hopeless! I've followed every instruction you gave me (no updates, 12.04.1 and 12.04.0 iso etc.). By the way, you are right, Ubuntu DE is very pleasant, I think I'll install it very soon but my colleagues prefer something more traditional and less effective on the system resource... so we come back also to LXDE!
Jokes aside, this is an interesting world, on one of those company's pcs I've installed KDE together with LXDE, and to me it seems to have different computers! But now I have to solve this problems... Some days ago I installed also Bleachbit: I've found it very similar to CCleaner for Windows world.