タッチパッドの無効化

sudo gedit /usr/share/X11/xorg.conf.d/50-synaptics.conf
の一番最後に、以下を記述
Section "InputClass"
Identifier "no need for accelerometers in X"
MatchProduct "SynPS/2 Synaptics TouchPad"
Option "Ignore" "on"
EndSection