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There is clearly some magic I don't fully understand going on here. In ROS 2 Crystal in 16.04 - failing, Dirk Thomas mentioned source as a problem, so I entered:

source ~/ros2_ws/install/local_setup.bash

After this, I tried to build again. This time it worked. I'm not sure why it did? I didn't have the option to source when I built the ros2_ws underlay.

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