Bug#626507: Solved
This link on launchpad actually solves the issue to me: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/346645.
> modprobe -r psmouse
> modprobe psmouse proto=imps
> options psmouse proto=imps
(on file /etc/modprobe.d/psmouse.conf
Pier Paolo
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