It appears that gpointing-device-settings was removed possibly due to never being finished and debugged.

In any case, I found touchpad-indicator (site is in Spanish, but Google translated it for me pretty good), also with the code here.

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.