@elliot, locking grub-pc and grub-common works to prevent boot problems caused 
by updating those packages. e.g. on a fresh install of Wubi. If you've already 
updated grub-pc or upgraded to 10.10, then the /boot/grub directory contains 
all the grub modules - and that results in the buggy grub.cfg file. Locking 
grub-* won't be enough in this case, you also have to clean up /boot/grub 
(restore it to what it is on a fresh wubi install).
sudo mv /boot/grub /boot/grubold
sudo mkdir /boot/grub
sudo cp /boot/grubold/grubenv /boot/grub/grubenv
sudo update-grub

The details are describe in the Wubi megathread on ubuntuforums.org:
http://ubuntuforums.org/showthread.php?t=1639198

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https://bugs.launchpad.net/bugs/653134

Title:
  Can't boot Ubuntu after an upgrade from 10.04.1 to 10.10

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