How do I disable tap-to-click on the touchpad in Ubuntu Gnome 17.04?

Just registered to spread the solution to this annyoing problem.

Make sure you have package xserver-xorg-input-libinput installed. Then you need to remove package xserver-xorg-input-synaptics and restart. After the restart you have all the options back in the GUI.

Everything is handled by xserver-xorg-input-libinput now. xserver-xorg-input-synaptics is interfering this.