Comment 59 for bug 1026046

If you're using 14.04.2 (utopic enablement stack), I have solved on xserver-xorg-input-synaptics-lts-utopic:

### Build the deb
apt-get build-dep xserver-xorg-input-synaptics-lts-utopic
apt-get source xserver-xorg-input-synaptics-lts-utopic
cd xserver-xorg-input-synaptics-lts-utopic
wget -q -O - https://bugs.freedesktop.org/attachment.cgi?id=100632 | patch -p1
# if it asks for a missing file, write: "src/synaptics.c" (without quotes) and press enter to confirm
dpkg-buildpackage -us -uc -nc
cd .. #here there should be your debs ready to be installed

### Configure trackpad
sudo mkdir -p /etc/X11/xorg.conf.d/
sudo wget -q -O /etc/X11/xorg.conf.d/10-synaptics.conf http://pastebin.com/raw.php?i=drJKRmW8
sudo gedit /etc/X11/xorg.conf.d/10-synaptics.conf

# Now set your value for AreaBottomEdge and save.
# Reboot and login again.

Note: this guide is based on a previous guide, but uses the patch that you find here https://bugs.freedesktop.org/attachment.cgi?id=100632