Markus Ludwig Grandpré writes:
Dpkg allows to skip database configuration. Is there routine or skript to create database, database user and all required tables after the installation process has finished?
Not the whole thing. The users and databases must be created by a database administrator.
After that, any "mailman" command will initialize the core's tables, and the "mailman-web migrate" command creates the Django tables for both Postorius and HyperKitty if mailman-web is installed, or you use the Django "manage.py migrate" command separately in both HyperKitty and Postorius if Debian uses the older installation without mailman-web. After the migrate command, you should use mailman-web or manage.py to issue the collectstatic, compress, and compilemessages commands for HyperKitty and Postorius.