Debconf

• The Debconf Programmer's Tutorial
• http://wiki.debian.org/DebConf

The actual config data

/var/cache/debconf/config.dat

The location of relevant files per package

/var/lib/dpkg/info

Finding packages that should work for dpkg-reconfigure:

find /var/lib/dpkg/ -name \*.postinst | xargs grep -l debconf| sed 's/^.*\/\(.*\)/\1/g;s/.postinst//g'