Easy Peasy.
Install touchegg.
sudo apt install touchegg
To enable 3 finger and above touch in Ubuntu 16.04 (of course be sure your touchpad driver supports multitouch, or else upgrade your kernel)
Go to your home directory and create a .xprofile with the following content.
synclient ClickFinger3=0 synclient TapButton3=0 touchegg &
Now when you boot your laptop, you’ll be able to use gestures.
To configure the gestures, you can go to
sudo vi .config/touchegg/touchegg.conf
It’s a pretty self explanatory config file. But here’s some references.
TechKnowHow 
Maybe good to mention that this seems to work when using gdm & Gnome. It doesn’t with Cinnamon, for example.
For cinnamon,
the strange use case that worked for me was, if I once went into suspend, and then reran the touchegg script, that worked.
But across different hardware these things have behaved differently it seems.
It doesn’t appear to work on ubuntu 16.04 also.
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