dpkg-reconfigure

Reconfigure one or more packages

$ dpkg-reconfigure [package1 package2 ...]

dpkg-reconfigure [options] package...

--default-priority
    Use the default priority as the minimum priority for questions.

-f frontend
    Selects the frontend to use for debconf (e.g., dialog, readline, noninteractive).

-p priority
    Sets the minimum priority of questions to display (low, medium, high, critical).

--force
    Force reconfiguration even if the package is in a broken state.

--no-reload
    Do not reload the debconf database.

--unseen-only
    Only show questions that have not been seen before.

--all
    Reconfigure all installed packages

The dpkg-reconfigure command reconfigures an already installed package. This is achieved by re-running the package's configuration scripts. This is useful for packages whose settings have been corrupted, or if you want to change the configuration options.
The command presents a series of prompts to the user, allowing them to modify the package's configuration.
It uses debconf to handle the configuration prompting, providing a consistent interface across different packages.
dpkg-reconfigure is a powerful tool for system administrators and advanced users who need to fine-tune package settings after initial installation.
However, it should be used with caution, as incorrect configuration can lead to system instability or package malfunction. It's generally best to consult the package's documentation or seek help from experienced users before making significant changes.

Using dpkg-reconfigure improperly can lead to system instability. It's important to understand the package's configuration options before making changes. Be cautious when using the --force option as it can potentially cause further problems if the package is already in a broken state.

A common use case is to reconfigure a network service after changing network settings. For example: dpkg-reconfigure openssh-server. This will allow you to redefine your ssh server configuration.

dpkg(1), debconf(7)