Comment 80 for bug 1026046

Thanks @Bob (caltinay) for the libinput insight.

I'm using Linux Mint 19, a Bionic based distro, and was suffering from the same issue.

libinput, in fact, was already installed. All I had to do is change the driver to libinput creating a file called /usr/share/X11/xorg.conf.d/90-libinput.conf with the following contents:

######################################
Section "InputClass"
    Identifier "libinput touchpad catchall"
    MatchIsTouchpad "on"
    MatchDevicePath "/dev/input/event*"
    Driver "libinput"
    Option "Tapping" "True"
    Option "DisableWhileTyping" "True"
EndSection
######################################

Clickpad now works exactly as it should. Touch sensitivity at the bottom area (where the buttons are located) is now correctly disabled.

Thanks!