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At least for python-catkin-pkg and python-catkin-pkg-modules it turned out that the OP had a allow-downgrade file in /etc/apt/preferences.d/ that pinned the priority of all Ubuntu repositories (ie: official ones) to 1001.

As python-catkin-pkg is also provided by the Ubuntu repositories (via Debian and the UpstreamPackages), the higher priority of the Ubuntu repositories caused apt to only want to install the 0.2.10-2 version and not the most recent one (at this point in time: 0.4.8-100).

Removing the allow-downgrade file at least resolved the python-catkin-pkg problem, but additional issues with apt then popped up.