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How to: 3 fingers tap to show Activities (Gnome Shell) ?

I know but it means that you have to use a second hand to press the
key or leave the touchpad to press the key. It would be more
convenient if you could show the Activities view with a three finger
tap and then select a window without leaving your touchpad.

The software touchégg ( https://github.com/JoseExposito/touchegg )
exists but it is not available in Debian repositories.