Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  grub-pc
0 upgraded, 0 newly installed, 1 to remove and 1353 not upgraded.
After this operation, 566 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 337353 files and directories currently installed.)
Removing grub-pc (2.02~beta2-9ubuntu1.12) ...
dpkg: error processing package grub-pc (--remove):
 subprocess installed pre-removal script returned error exit status 10
Errors were encountered while processing:
 grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)