Install a downloaded Debian (Ubuntu) package (.deb):
sudo dpkg -i packagename.deb
Remove a Debian (Ubuntu) package (.deb):
sudo dpkg -r packagename
Reconfigure/Repair an installed Debian (Ubuntu) package (.deb):
sudo dpkg-reconfigure packagename
Example:
sudo dpkg-reconfigure mpd
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source:http://linuxpoison.blogspot.com/2009/10/13578175712569.html