Comment 18 for bug 742967

Maddy, maybe i wasn't clear. It worked (initially) but the wubildr wasn't updated and finally it dropped me at a grub prompt. (That was buried a bit in my analysis).

Anyway... to continue:
I ran "sudo grub-install /dev/sda2" (My /host is /dev/sda2) and it regenerated the /host/wubildr (also populated the files in the /boot/grub)...

and now it's booting again.

So... it looks like it's a manual regeneration of wubildr that's required on both 'windows-partition' installs as well as 'non-windows-partition' installs.