Bug#567618: Unable to boot after upgrade.

[Alexander Holmes]

I was also unable to boot and used a similar method to Geoff to fix the
problem, i.e. upon booting I received

GRUB loading.
Welcome to GRUB!

error: the symbol 'grub_env_find' not found.
Entering rescue mode...
grub rescue>

however then was able to fix the problem by chrooting into my system
from a live cd and then apt-get remove ing the grub-pc package, then
installing it again, rather than using the squeeze package.

--
Alex Holmes