Touchpad Problem - shortly after login, it stops working

There is another command that works, and is perhaps more direct:

sudo modprobe -r psmouse && sudo modprobe psmouse

The problem is that it is not a permanent solution. I already tried adding psmouse to the /etc/modules file, but the problem is not about the driver not loading, but crashing or something.

Does the unity replacement command work as a "permanent solution"?

If this happents, use Ctrl+Alt+T to open a terminal and type:

synclient TouchpadOff=0

I had the same problem as well, the only thing that I did was in the terminal:

    unity --replace

after that it hasn't been an issue.