Unpacking dovecot-core (from .../dovecot-core_1%3a2.0.19-0ubuntu2_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/dovecot-core_1%3a2.0.19-0ubuntu2_i386.deb (--unpack):
 trying to overwrite '/etc/init.d/dovecot', which is also in package dovecot-common 1:2.0.19-0ubuntu2
Processing triggers for ureadahead ...
Processing triggers for ufw ...
Processing triggers for man-db ...
Errors were encountered while processing:
 /var/cache/apt/archives/dovecot-core_1%3a2.0.19-0ubuntu2_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)