Configure a package which has been unpacked but not yet config‐
ured. If -a or --pending is given instead of package, all
unpacked but unconfigured packages are configured.
Configuring consists of the following steps:
1. Unpack the conffiles, and at the same time back up the old
conffiles, so that they can be restored if something goes wrong.
2. Run postinst script, if provided by the package.
dpkg-reconfigure - reconfigure an already installed 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. See debconf(7) for a list.
Reconfigure all installed packages that use debconf. Warning: this
may take a long time.
dpkg --configure -a will configure all unpacked but unconfigured packages. whereas
dpkg-reconfigure -phigh -a will reconfigure all installed packages that use
debconf with high priority.