Comment 8 for bug 942316

After reviewing this - I suspect the issue is the modifications to ata_piix to prevent it from loading on a Hyper-V platform. Since ata_piix now detects a Hyper-V platform and unloads if it's found, this would prevent the OS from installing. We need a modification to the patch here (http://people.canonical.com/~apw/lp929545-precise/0001-ata_piix-defer-to-the-Hyper-V-drivers-by-default.patch) that will only unload the block device handling, not the CD/DVD device handling.