I am trying to catkinmake a new catkin ws. It always throws following error: ModuleNotFoundError: No module named 'catkinpkg'

Infos:

dpkg -L python-catkin-pkg-modules

/.
/usr
/usr/lib
/usr/lib/python2.7
/usr/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages/catkin_pkg
/usr/lib/python2.7/dist-packages/catkin_pkg/__init__.py
/usr/lib/python2.7/dist-packages/catkin_pkg/changelog.py
/usr/lib/python2.7/dist-packages/catkin_pkg/changelog_generator.py
/usr/lib/python2.7/dist-packages/catkin_pkg/changelog_generator_vcs.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/__init__.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/create_pkg.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/find_pkg.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/generate_changelog.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/package_version.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/prepare_release.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/tag_changelog.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cli/test_changelog.py
/usr/lib/python2.7/dist-packages/catkin_pkg/cmake.py
/usr/lib/python2.7/dist-packages/catkin_pkg/condition.py
/usr/lib/python2.7/dist-packages/catkin_pkg/group_dependency.py
/usr/lib/python2.7/dist-packages/catkin_pkg/group_membership.py
/usr/lib/python2.7/dist-packages/catkin_pkg/metapackage.py
/usr/lib/python2.7/dist-packages/catkin_pkg/package.py
/usr/lib/python2.7/dist-packages/catkin_pkg/package_templates.py
/usr/lib/python2.7/dist-packages/catkin_pkg/package_version.py
/usr/lib/python2.7/dist-packages/catkin_pkg/packages.py
/usr/lib/python2.7/dist-packages/catkin_pkg/python_setup.py
/usr/lib/python2.7/dist-packages/catkin_pkg/rospack.py
/usr/lib/python2.7/dist-packages/catkin_pkg/templates
/usr/lib/python2.7/dist-packages/catkin_pkg/templates/CMakeLists.txt.in
/usr/lib/python2.7/dist-packages/catkin_pkg/templates/metapackage.cmake.in
/usr/lib/python2.7/dist-packages/catkin_pkg/templates/package.xml.in
/usr/lib/python2.7/dist-packages/catkin_pkg/terminal_color.py
/usr/lib/python2.7/dist-packages/catkin_pkg/tool_detection.py
/usr/lib/python2.7/dist-packages/catkin_pkg/topological_order.py
/usr/lib/python2.7/dist-packages/catkin_pkg/workspace_vcs.py
/usr/lib/python2.7/dist-packages/catkin_pkg/workspaces.py
/usr/lib/python2.7/dist-packages/catkin_pkg_modules-0.5.2.egg-info
/usr/lib/python2.7/dist-packages/catkin_pkg_modules-0.5.2.egg-info/PKG-INFO
/usr/lib/python2.7/dist-packages/catkin_pkg_modules-0.5.2.egg-info/dependency_links.txt
/usr/lib/python2.7/dist-packages/catkin_pkg_modules-0.5.2.egg-info/requires.txt
/usr/lib/python2.7/dist-packages/catkin_pkg_modules-0.5.2.egg-info/top_level.txt
/usr/share
/usr/share/doc
/usr/share/doc/python-catkin-pkg-modules
/usr/share/doc/python-catkin-pkg-modules/changelog.Debian.gz
/usr/share/doc/python-catkin-pkg-modules/copyright

--

sudo dpkg -L python-catkin-pkg

/.
/usr
/usr/bin
/usr/bin/catkin_create_pkg
/usr/bin/catkin_find_pkg
/usr/bin/catkin_generate_changelog
/usr/bin/catkin_package_version
/usr/bin/catkin_prepare_release
/usr/bin/catkin_tag_changelog
/usr/bin/catkin_test_changelog
/usr/lib
/usr/lib/python2.7
/usr/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages/catkin_pkg-0.5.2.egg-info
/usr/lib/python2.7/dist-packages/catkin_pkg-0.5.2.egg-info/PKG-INFO
/usr/lib/python2.7/dist-packages/catkin_pkg-0.5.2.egg-info/dependency_links.txt
/usr/lib/python2.7/dist-packages/catkin_pkg-0.5.2.egg-info/entry_points.txt
/usr/lib/python2.7/dist-packages/catkin_pkg-0.5.2.egg-info/requires.txt
/usr/lib/python2.7/dist-packages/catkin_pkg-0.5.2.egg-info/top_level.txt
/usr/share
/usr/share/doc
/usr/share/doc/python-catkin-pkg
/usr/share/doc/python-catkin-pkg/changelog.Debian.gz
/usr/share/doc/python-catkin-pkg/copyright

--

which python

/usr/bin/python

--

python -V

Python 2.7.17

--

export | grep ROS

declare -x ROSLISP_PACKAGE_DIRECTORIES=""
declare -x ROS_DISTRO="melodic"
declare -x ROS_ETC_DIR="/opt/ros/melodic/etc/ros"
declare -x ROS_MASTER_URI="http://localhost:11311"
declare -x ROS_PACKAGE_PATH="/opt/ros/melodic/share"
declare -x ROS_PYTHON_VERSION="2"
declare -x ROS_ROOT="/opt/ros/melodic/share/ros"
declare -x ROS_VERSION="1"