I was using 10.10, so I did not want to upgrade. I downloaded the
ubuntu-12.04.1-desktop-amd64.iso and burn into a pen-drive. I tried to install twice and both times, I got stucked on this orange screen without windows.
Then I downloaded again on a Mac, the same
.iso, checked the md5 and burn to a CD. But again, I got the same orange screen.
I have four partitions, one is for
Windows OS, the
second a free space to files that I use on both OS, the
third are Ubuntu and swap. Grub is OK.
The Ctrl+Alt+F1 method doesn't work.