package dependencies

Am trying to install bacula with postgres and am running into problems.

Installed packages:
# dpkg -l | grep bacula
ii bacula-common 5.0.1-1ubuntu1
ii bacula-common-pgsql 5.0.1-1ubuntu1
ii bacula-director-common 5.0.1-1ubuntu1
ii bacula-director-pgsql 5.0.1-1ubuntu1
ii bacula-doc 5.0.1-1

Now, installing the missing packages:
[snip]
Recommended packages:
  mysql-server bacula-sd-tools
The following packages will be REMOVED:
  bacula-common-pgsql bacula-director-pgsql
[snip]

this is great, I have a dbms installed, the correct support packages for the dbms and now this?
Looks like there is something broken with the dependencies? I tried the --no-install-recommends
option, but still the same behaviour. apt tries to remove the two pgsql packages.

regards,
Marcus