Comment 3 for bug 770091

This problem repeated itself when I tried to install Oneiric Alpha 3 via http://cdimage.ubuntu.com/releases/oneiric/alpha-3/oneiric-desktop-amd64.iso

However, while previously only the grub menu entries for the new version became non-working, this time grub was really screwed up, leaving me with a "grub rescue>" prompt and not being able to start the system from the disk. After having spent a few hours on a failed attempt to fix it, I took my laptop to the store where I bought it and payed them for doing it.

After that and as before I was able to successfully install Alpha 3 via the alternate image.

I really think that this bug should be given high priority. In my case it resulted in a computerless state for a day (imagine!).