You could try installing 12.04 from the alternate install CD. This is a text based installer that is very similar to a Debian install. This should bypass any graphical issues during the install.
After 12.04 is installed then reboot and install the ATI proprietary driver. If you can not boot to the graphical desktop after installing 12.04 then try installing the ATI driver from recovery mode. There is also an option to "fix graphics" (or whatever it says exactly) in the recovery mode that you could try.
Last edited by tommcd; 05-25-2012 at 02:25 AM.
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