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After a fresh install (reformatting the entire disk) of Ubuntu 9.10 or Mythbuntu 9.10, system freezes while loading Grub (grub2). Normal rescue techniques (booting from live CD and running update-grub) don't work. Update-grub fails with:

Generating grub.cfg ...
Found memtest86+ image: /boot/memtest86+.bin
grep: /proc/mounts: No such file or directory
Cannot find list of partitions!
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up vote 0 down vote accepted

The answer seems to be disconnect any RAID array(s) on your motherboard.

I had a 4 disk RAID5 array in addition to the disk I was installing onto. When I disconnected those 4 disks so the installer only saw one hard disk, the install went perfectly.

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