I upgraded my ubuntu gnome installation to 16.04.3 LTS (GNOME) and everything is kinda good except for the touchpad single-tap functionality. Single-tap-to-click is not working.
Edit (by cipricus - in order to avoid creating a duplicate question): not only is it not working, but the setting presented in Gnome Help here (Open the Activities overview and start typing Mouse & Touchpad. - Click on Mouse & Touchpad to open the panel. - In the Touchpad section, check Tap to click.) is not applicable in Ubuntu Gnome 16.04, as the Touchpad section is simply absent there:
How come? I know this is already answered, but why is the Touchpad section absent? I will add a bounty for this.