http://www.ubuntugeek.com/install-pidgin-instant-messanger-in-ubuntu.html
sudo dpkg -i --force-overwrite --force-bad-verify --force-conflicts --force-overwrite-dir pidgin_xxx.deb
http://www.ubuntugeek.com/install-pidgin-instant-messanger-in-ubuntu.html
sudo dpkg -i --force-overwrite --force-bad-verify --force-conflicts --force-overwrite-dir pidgin_xxx.deb