Migrating to /dev/sda1 can stop wubi booting

[bcbc]

Wubi uses an old version of grub4dos to boot that cannot read (hangs up on) ext4 partitions. If a user migrates to /dev/sda1, then trying to boot Wubi (from Windows) no longer works.
Potential fixes - if target is lower than partition containing /wubildr, then force it to be ext3.
Note: this doesn't affect the migration. Only if the user decides not to install the Grub2 bootloader.
Fix: from Windows, format the partition as ntfs. This will allow Wubi to boot again.

[bcbc]

Apparently this affects ext3 as well. This has been fixed in the wubildr.mbr for Oneiric 11.10.

[bcbc]

Since this is fixed going forward from 11.10, and in any case, most people with Wubi will migrate to a logical partition e.g. /dev/sda5, I'm marking this as low priority (and not likely to address)