Sorry to hear that. What I've done is gathered the stuff for adding a new model and put it in one place, post #2, at the beginning of the HOW TO. It's a stand alone mini HOW TO on adding one of the new models. I still have to check a few things but I think it is usable now.
Since you appear to be using Ubuntu Studios that may be the difficulty. We've had problems with it. Unfortunately it seems different each time. First check the Troubleshooting section. See what kernel you are running and whether you need the 64-bit flag.
The lines to do that are in the sample xsetwacom script .xsetwacom.sh. They look like:
in the stylus section. If you want the button assignments reversed change them like so:
xsetwacom set 9 Button2 "3" # right mouse click
xsetwacom set 9 Button3 "2" # middle mouse click
Using your "Device name" from 'xinput --list' for the ID #9 that the example shows.
xsetwacom set 9 Button2 "2" # middle mouse click
xsetwacom set 9 Button3 "3" # right mouse click