I've had some trouble with WebCam & Ubuntu. 19.10 won't recognise Logitech camera, was about to junk it (the camera) but tried with Ubuntu daily build 20.04 on which it worked with Cheese.
However on today's 20.04 build it doesn't work. (Cheese says Camera not connected). I have not put any effort into chasing this down. I will after 20.04 LTS is released.