It appears that gpointing-device-settings was removed possibly due to never being finished and debugged.
I installed it using:
sudo add-apt-repository ppa:atareao/atareao sudo apt-get update sudo apt-get install touchpad-indicator
And then running touchpad-indicator I got an icon in the task bar. Clicking on it brought up preferences. Note that the icon was very light by default for me, but under the icon -> preferences -> theme you can make it darker if you like. It also crashed on me the first time with something about a missing file, but the second time I ran it, it seemed to work fine. It may be necessary to manually add it to the default apps for LXSession (under LUbuntu menu -> Preferences) so it will start whenever you log in.