Amoko wrote:I can not install ubuntu 12.04.
Or more precisely I may have installed it, but the screen shows only gibberish. Is there a way around this problem?
First thing - I have a GeForce 8400GS on one of my machines and I was able to install 12.04 to it and see a working Unity desktop both with the default nouveau driver and after I had installed the proprietary nvidia driver, so I doubt your graphics card is the problem.
So let's step back a bit. You say "I may have installed it". Were you using a live CD or live USB with the desktop ISO, or were you using the alternate CD ISO? If you were using the desktop ISO, did you choose "Install Ubuntu" or did you choose "Try Ubuntu" and then install from the live desktop? If you have a CD or USB created from the desktop ISO, what happens when you boot from it now? Can you get a usable live desktop session?