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The default version of libopencv in ubuntu 20 is 4.2.0. Many ROS packages depend on this. If you want to use ROS, you should remove all other versions and re-install 4.2.0 from apt.

You can NOT easily use any other version of opencv in noetic. You could try to build ros packages from source, but even then ROS might not work correctly because the opencv API changes frequently.

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