How To fix screen tearing in Ubuntu 2021.10

I used to have this problem, and I fixed it just simply by changing the refresh rate in the display settings so instead of using 60Hz I used 59.96Hz

Display Settings screenshot

This problem is related to your screen refresh rate because it's not truly 60hz or 120hz. It's more like as close as possible. Still, that will cause the screen tearing problem if not set to be the same (or half if you have 120hz and want to you 60Hz though that would be just crazy)