GNU/Linux GNOME Wayland Trackball Scroll Wheel Emulation Setup – Step-by-step Guide
The tutorial shows you step-by-step How to Manually Enable the Trackball Scroll Wheel Emulation in GNOME Wayland GNU/Linux desktop – Step by step Tutorial.
And the Trackball Scroll on GNOME desktop is here enabled with the Click Button & Move gesture.
Finally, this Setup has been successfully Tested on a Kensington Expert Mouse 4 Buttons Trackball.

1. Launching Terminal
How to QuickStart with Command Line on GNU/Linux
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