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If you haven't explicitly changed the version of python that you're using, you're probably still using the default. You can confirm which version of python you're using with:

which python
python -V

You can confirm that the python-catkin-pkg package is installed correctly by listing the files that it should contain:

dpkg -L python-catkin-pkg

The most important thing to verify here is that python-catkin-pkg is installed into a directory that matches your python version.