Toshiba Satellite P745 Touchpad problem
Solution 1:
This also happen to my laptop after I've installed Ubuntu Gnome 14.04.2. The solution for my problem was (perhaps this would also work for you) to install the following package.
xserver-xorg-input-synaptics
Because this package is not automatically installed by default. I don't know why they don't do this by default. Hope it works for you as well. Cheers.