Enabling tapping on touchpad on Debian Mate Desktop.

I installed Mate Desktop on Debian 9 "Stretch" recently and found that tapping on touchpad did not work and the setting was missing in Mate Control Centre.

After searching I found the solution on Debian Wiki

# mkdir -p /etc/X11/xorg.conf.d
# echo 'Section "InputClass"
        Identifier "libinput touchpad catchall"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
        Option "Tapping" "on"
EndSection' > /etc/X11/xorg.conf.d/40-libinput.conf