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Seems to have been my fault. For some strange reason my ros2-latest.list was:

deb [arch=amd64] http://packages.ros.org/ros2/ubuntu focal main
deb [arch=amd64,arm64] http://packages.ros.org/ros2/ubuntu bionic main

Removing the bionic line and re-installing python3-catkin-tools fixed the problem. I had gotten a later version from bionic installed which caused the problem.

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