Comment 13 for bug 459054

I was able to install using the alternate installer. An option comes up to disable software raid, which I accepted. As a result I'm able to see all disks. Later after installation completes, I ran update-grub, and got some errors about software raids (of which I should have none, and if I do they're unintentional), and it fails to parse operating systems on other drives. I removed the "dmraid" package, and reran update-grub, and it works correctly.

This problem is somehow related to incorrectly picking up software raid volumes that aren't in use, or previously existed.

A workaround is as I explained, use the alternate installer, and immediately remove the "dmraid" package.