Comment 4 for bug 18874

Seems to me that is a driver version problem:
package xserver-xorg-input-synaptics it's version 0.14.3 while
package ksynaptics 0.2.4 wants version 0.14.4 at least:

dinwath@sandhalphon:~$ dpkg-query -W "xserv*synap*"
xserver-xorg-input-synaptics 0.14.3+seriouslythistime-0ubuntu3
dinwath@sandhalphon:~$ dpkg-query -W "ksynap*"
ksynaptics 0.2.4-2ubuntu2
dinwath@sandhalphon:~$ cat /var/log/Xorg.0.log|grep Synap
(**) |-->Input Device "Synaptics Touchpad"
(II) Synaptics touchpad driver version 0.14.3
(--) Synaptics Touchpad auto-dev sets device to /dev/input/event3
(--) Synaptics Touchpad touchpad found
(**) Synaptics Touchpad: always reports core events
(II) XINPUT: Adding extended input device "Synaptics Touchpad" (type: MOUSE)
Synaptics DeviceInit called
SynapticsCtrl called.
Synaptics DeviceOn called
(--) Synaptics Touchpad touchpad found

see attachment for screenshoot of ksynaptics window