debian - cleaning up stale configuration files

As suggested in Debian Cleanup Tip #1: Get rid of useless configuration files, it's worth using grep-status to retrieve information about configuration files left behind a package removal or upgrade.

For example, on my Squeeze VM:

$ grep-status -n -sPackage -FStatus config-files
libjack-jackd2-0

You can confirm with 'dpkg -l' that's a package in 'rc' status:

$ dpkg -l | grep libjack-jackd2-0
rc libjack-jackd2-0 1.9.6~dfsg.1-2 JACK Audio Connection Kit (libraries)

You may probably want to remove definitely those configuration files; just purge the package. For example:

$ dpkg -P libjack-jackd2-0

See also about debian configuration files, an important assumption Debian takes.