During the upgrade from 12.04 to 12.10, grub-pc failed to update.
dpkg: error processing grub-pc (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
grub-pc
I have already tried apt-get purge grub-pc and reinstalling it, but the same error keeps coming up.
During the upgrade a few windows from Grub popped up asking me if I wanted to keep or replace the configuration files for Grub. I clicked the "keep" button on all of them. I suspect that might be the problem
grub-pcto update, but it may be a blessing on a UEFI-enabled system, in that grub might stop working if updated. – hardmath Feb 08 '14 at 00:24