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Trying to update opencv in ROS is a bad idea. In theory it can be done, but you must now locally build any ROS packages that rely on opencv from their source code, and that's a lot of work. It may be less work to upgrade to noetic if it is using a version of opencv that is acceptable to you.

Trying to update opencv in ROS is a bad idea. In theory it can be done, but you must now locally build any ROS packages that rely on opencv from their source code, and that's you have to debug any library changes the opencv devs made. It is a lot non-trivial amount of work. work.

It may be is less work to upgrade to noetic if it is using a version of opencv that is acceptable to you.