I followed advice from answers to the queston "How to enable natural scrolling with mouse in 17.04?", https://askubuntu.com/questions/904684/how-to-enable-natural-scrolling-with-mouse-in-17-04.
In my case removing xserver-xorg-input-synaptics and restarting did the trick:
sudo apt remove xserver-xorg-input-synaptics
I followed advice from answers to the queston "How to enable natural scrolling with mouse in 17.04?", https:/ /askubuntu. com/questions/ 904684/ how-to- enable- natural- scrolling- with-mouse- in-17-04.
In my case removing xserver- xorg-input- synaptics and restarting did the trick:
sudo apt remove xserver- xorg-input- synaptics