root@lubuntu:/# dpkg -r --force-all grub-pc
(Reading database ... 337353 files and directories currently installed.)
Removing grub-pc (2.02~beta2-9ubuntu1.12) ...
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/^(.*?)(\\)?\${ <-- HERE ([^{}]+)}(.*)$/ at /usr/share/perl5/Debconf/Question.pm line 72.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/\${ <-- HERE ([^}]+)}/ at /usr/share/perl5/Debconf/Config.pm line 30.
dpkg: error processing package grub-pc (--remove):
 subprocess installed pre-removal script returned error exit status 10
Errors were encountered while processing:
 grub-pc