Comment 12 for bug 1875528

To address the two other commenters who mentioned fractional scaling - that's definitely the cause of the extra mouse cursor in my case. If I set the display scaling back to 100%, the extra cursor goes away and stays away between reboots and logout/login cycles. Upon setting it back to 125%, the second cursor initially remains gone, but returns when I reboot the machine or log out and then back in.

I'm also on 20.04, on a Thinkpad A485, Ryzen 7 Pro 2700U w/ Radeon Vega gfx.