Package doesn't start after installation

Note: This bug is related to the package "pdns-server" which doesn't exist according to this bug tracker. That's a bug, it really does exist: https://packages.ubuntu.com/focal/pdns-server

When installing the pdns-server package, it automatically installs the pdns-backend-bind package as well. That contains a configuration file that prevents the PowerDNS server from starting. This is in the log:

Fatal error: Trying to set unknown parameter 'bind-config'

That parameter is included in /etc/powerdns/pdns.d/bind.conf.

Actually, I don't even want to use that BIND package, but the Postgres backend instead. I installed it like this:

apt install pdns-backend-pgsql pdns-server

pdns-server requires pdns-backend which is provided by pdns-backend-bind, pdns-backend-pgsql and some more. So something is wrong with the package dependencies or the package manager. I wanted to install two packages and that's all they need. In addition to the backend I chose, another one was installed which I didn't request.

Installing pdns-backend-pgsql alone doesn't help either because that depends on pdns-server and then the crazyness starts from the beginning, including the undesired bind backend.

When the installed server cannot start, it generates 10 syslog lines each second, for an indefinite time. Reading the log can become an impossible task if it sits there like this for a day, filling the log endlessly.