Well, I'm really using Kubuntu 18.04 at the moment. That machine will be switched to Manjaro when I have the time (among other benefits of Manjaro, the tablet "just works" there)
- download the two drivers from here:
https://github.com/linuxwacom/input-wacom/releases
https://github.com/linuxwacom/xf86-input-wacom/releases
- run
./install.sh
Whenever Ubuntu gets kernel updates, the driver needs to be recompiled with the current kernel to work.
Ideally I would create a PPA with this...