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First things first, let’s install Ubuntu. Insert your CD, DVD, whatever and at this screen
press any key to get the old language choosing menu. Select your language and press F6. In this menu select nomodeset, as in the following image.
Tell Ubuntu to start in live desktop mode (first option) and start the installer as you usually do. Your screen resolution will be just wrong, but it doesn’t matter right now.
Once installation has completed, do not restart your PC, you must first disable KMS on your brand new Ubuntu. In a terminal run
sudo -s mount /dev/[partizione_dove_avete_installato_ubuntu] /mnt echo options nouveau modeset=0 > /mnt/etc/modprobe.d/nouveau-kms.conf
Now you can reboot and your Ubuntu will start correctly. Except for the resolution, but this will be the topic of the next howto.