There is a simple way to disable/enable your laptop's touchpad in Ubuntu without removing synaptics driver,so when you want to enable your touchpad ,you no need to re-install the driver:
Edit your xorg.conf file: sudo gedit /etc/X11/xorg.conf ,then add a line: Option "SHMConfig" "on" below Section "InputDevice" as below :
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "HorizEdgeScroll" "0"
Option "SHMConfig" "on"
SHMConfig on indicates that configuration permission for touchpad 's parameters has been started,you can already use below commands to control your touchpad:
command：synclient touchpadoff=1 －－disable touchpad
command：synclient touchpadoff=0 －－enable touchpad
hhaa,my touchpad was disabled:
:),my touchpad was enabled again:
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