dpkg-reconfigure reconfigures packages after they have already been installed. Pass it the names of a package or packages to reconfigure.
Note that if you normally have debconf set to use the noninteractive frontend, dpkg-reconfigure will use the dialog frontend instead, so you actually get to reconfigure the package.
Specify the minimum priority of question that will be displayed. dpkg-reconfigure normally shows low priority questions no matter what your default priority is.
Reconfigure all installed packages that use debconf. Warning: this may take a long time.
By default, all questions are shown, even if they have already been answered. If this parameter is set though, only questions that have not yet been seen will be asked.
Force dpkg-reconfigure to reconfigure a package even if the package is in an inconsistent or broken state. Use with caution.