Comment 10 for bug 681535

I experience the same issue as Sam Banks and others. Here is my configuration (I used the alternate amd64 11.04 iso)

- Unencrypted /boot partition mounted on md0 RAID1, ext4 filesystem.
- Encrypted LVM partitions on top of md1 RAID1, ext4 filesystem (/, /opt, /home & swap).

Grub2 install fails with message: "Impossible to install GRUB on /dev/sda. This error is fatal."

I've tried chrooting (after mounting all required partitions and binding /proc, /dev, & /sys), but this way I obtain the same error as in the original post but instead of the "Auto-detection of a filesystem of /dev/md0 failed", I get "Auto-detection of a filesystem of /dev/mapper/vg--system-root1 failed.".

vg-system is the name of my LVM volume group and root1 is the '/' mount point.

The grub version present in the Fedora 15 distribution does not suffer this problem. I replicated the same partitionning without a problem (and it worked in the past, I think for the Ubuntu 10.04 alternate installer).