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Uninstalling Opencv 4.0.0 to 3.4

Hello, everyone, I would like some help in uninstalling my current version of opencv to a different one. I'm fairly new to this and I would greatly appreciate a step by step tutorial on how to go about this in the quickest and least painful manner. The opencv software is running on Ubuntu 16.04 on a raspberry pi. I'm attempting to use the opencv to use facial detection via webcam. Please inform me if you need any additional information.