I'm still in the process of evaluating Unity vs Gnome on Ubuntu 18.04.1
In Unity I noticed that there is no setting for natural scrolling.
In the dconf-editor natural scrolling is set to on.
But it is not scrolling traditionally - how to fix this?
Linked post explains how to set another property of touchpad, so for clarity I'll write it down here:
Install Synaptics TouchPad driver for X.Org server:
and re-login.