Times ago I have installed Linux mint stuff on my Ubuntu 11.10 (now 12.04). I accidentally removed some files manually ( they were under /usr/share.). Now it is impossible to remove the related deb packages, and synaptic report various errors. How can remove them bypassing errors? It is possible view the installed files in synaptic and remove them manually, but is tedious...also remain the problem to remove the files entry from the apt database. Any suggestion?