Well, I admit I have never used apt-get -b. In any case, you also have to change the version number and remove the patches from the package. I'll try out the Debian package later, I'm pretty sure a current one should also work in Ubuntu.
If you only tested the drivers from this thread, all you need to do is to go to the synaptics package manager, search for the term "egalax", remove the corresponding packages, then download the right ones and install them again. To remove all calibration information, simply delete the file /usr/lib/X11/xorg.conf.d/97-touchscreen-calibration.conf using the following command:
If you changed the file /etc/X11/xorg.conf, it's probably best if you also remove that file. After a reboot, everything should hopefully work then.
sudo rm /usr/lib/X11/xorg.conf.d/97-touchscreen-calibration.conf
If you tried other things like the proprietary EETI driver, it's more difficult to get rid of them.
When you swipe your fingers on the desktop, twofing simply emits Ctrl+Alt+Left and Ctrl+Alt+Right key presses. As they are also default in Metacity, this should also work when you don't use compiz (unless you have changed the key shortcuts). At least it works for me. The only problem is that you have to perform the gesture when the Desktop has the focus, thus no other window is active. Of course twofing can be modified to send these keycodes in all applications, but then you lose horizontal scrolling. Currently, you have to adapt the source code of twofing to achieve this: In profiles.h, simply change the scrollLeftAction and scrollRightAction of all profiles (also the default profile) to the value used in the profile for the window id "desktop_window" and compile twofing then. In the future, I plan to make the profiles configurable using configuration files, so you no longer have to change the source code.