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using UBUNTU 20.04 I am following the same tutorial. But, the above solution did not work. I have opencv installed to local python via sudo apt install libopencv-dev python3-opencv Instead, I edited the package.xml file of my project to depend on python3-opencv rather than the suggestions above, and the project built successfully.

As I am still rather new to package management I would appreciate it if anyone could explain why this was what I needed to do rather than the users above. Since I have the same UBUNTU and ROS2 running.

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