Does running "sudo dpkg-reconfigure xserver-xorg" automatically insert the synaptics section? If so, this is probably a duplicate of bug #40503.
** Changed in: xorg-server (Ubuntu) Status: Unconfirmed => Needs Info -- Synaptics touchpad not configured in xorg.conf on Samsung X20 https://launchpad.net/bugs/47925 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs