Debconf

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

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

FAQ

delete values from database

When testing your config file you will find that after 1 try it no longer shows dialog, fix this by setting priority to critical and clean database. It does not seem possible to directly edit config.dat, but:

echo PURGE | debconf-communicate <packagename>