This has been reported elsewhere, and bug reports filed, but I can confirm that the 12.04 iso image (burned on a USB stick in my case) won't install if there is an Nvidia GTX-550TI in the slot.
Here is what I see:
1. Loading operating system...
2. Purple screen, for a very few seconds.
3. Black screen, cursor flashing
4. Disk activity light flashes off and on for 20-30 seconds
5. Disk activity stops flashing, screen still black with cursor
I want to stress that no Grub menu is displayed. There is no way to edit the kernel options or get to a shell.
The same image on the same USB stick works with no issues with an AMD card in the slot.
I believe this is a problem with all 3.2-3.3 kernels.
Does anyone know if Ubuntu is going to patch their kernel and update the download image? This problem means a large number of Nvidia owners cannot install 12.04.



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