Have you asked (or searched) the Ubuntu forums?
The fact that you removed the Ubuntu software to make it work sounds strange.
That it works anyway is thanks to "udev" and "evdev".
Check /usr/share/X11/xorg.conf.d/ it should contain a file like this one 10-evdev.conf:
# Catch-all evdev loader for udev-based systems
# We don't simply match on any device since that also adds accelerometers
# and other devices that we don't really want to use. The list below
# matches everything but joysticks.
Section "InputClass"
Identifier "evdev pointer catchall"
MatchIsPointer "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
EndSection
Section "InputClass"
Identifier "evdev keyboard catchall"
MatchIsKeyboard "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
EndSection
Section "InputClass"
Identifier "evdev touchpad catchall"
MatchIsTouchpad "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
EndSection
Section "InputClass"
Identifier "evdev tablet catchall"
MatchIsTablet "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
EndSection
Section "InputClass"
Identifier "evdev touchscreen catchall"
MatchIsTouchscreen "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
EndSection
You could add another one for the Genius tablet.
It should have a higher number,name it 50-genius.conf.
Read the manual for xsetwacom ( man xsetwacom).
Even though the name is wacom doesn't mean it's only for Wacom tablets.
Yes it means using CLI but that's Linux.
Gerard.