como respondido aqui
To enable the touchpad tapping permanently , copy the
50-synaptics.conf
file to/etc/X11/xorg.conf.d
then edit it by addingOption "TapButton1" "1"
cp /usr/share/X11/xorg.conf.d/50-synaptics.conf /etc/X11/xorg.conf.d/50-synaptics.conf
The
/etc/X11/xorg.conf.d/50-synaptics.conf
should be:Section "InputClass" Identifier "touchpad catchall" Driver "synaptics" MatchIsTouchpad "on" Option "TapButton1" "1" Option "TapButton2" "3"
Reboot your system
no seu caso, defina TapButton1 para 0 para ficar assim
Section "InputClass"
Identifier "touchpad catchall"
Driver "synaptics"
MatchIsTouchpad "on"
Option "TapButton1" "0"