Install the
ksynaptic package. It should be available in one of your repositories. (Note: I'm a Fedora user, but I
think, but don't really know, that this is correct for you, too.)
Your device section in
xorg.conf should look something like this:
Code:
Section "InputDevice"
Identifier "Synaptics"
Driver "synaptics"
Option "Device" "/dev/input/mice"
Option "Protocol" "auto-dev"
Option "Emulate3Buttons" "yes"
Option "SHMConfig" "true"
Option "UseShm" "true"
EndSection