Fix - Touchpad Gestures not working on Ubuntu

I noticed that the three finger swipe touchpad gestures had suddenly stopped working on my desktop. Features such as switching desktops, all windows view also stopped working.

This is what fixed it:

1. Log out.

2. At corner left there is an option that says

    - Ubuntu on Xorg

    - Ubuntu on Wayland ✅

 3. Click on Ubuntu on Wayland and log in again. 

Reason for this issue:

There are no three finger touchpad gestures on X11.. Switch to Wayland to enable touchpad gestures. 

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Notes:

Xorg and Wayland are display systems used by Ubuntu. 

• Xorg is the older display system. It is very stable and compatible, but has limited touchpad gestures..
• Wayland is the modern replacement for Xorg. It has better performance and security, and is gesture friendly.