Following the advice found here:
https://www.reddit.com/r/SolusProject/comments/86vmjf/gfxtablet_doesnt_work/
the device will show in xinput by adding an entry in (on Ubuntu) /lib/udev/hwdb.d
However it is mistakenly shown as a keyboard:
/var/log/Xorg.0.log:
135035.476] (II) config/udev: Adding input device Network Tablet (/dev/input/mouse1)
[135035.476] (II) No input driver specified, ignoring this device.
[135035.476] (II) This device may have been added with another device file.
[135035.564] (II) config/udev: Adding input device Network Tablet (/dev/input/event17)
[135035.564] (**) Network Tablet: Applying InputClass "evdev tablet catchall"
[135035.564] (**) Network Tablet: Applying InputClass "libinput tablet catchall"
[135035.564] (II) Using input driver 'libinput' for 'Network Tablet'
[135035.565] (**) Network Tablet: always reports core events
[135035.565] (**) Option "Device" "/dev/input/event17"
[135035.565] (**) Option "_source" "server/udev"
[135035.565] (II) event17 - Network Tablet: is tagged by udev as: Tablet
[135035.584] (II) event17 - Network Tablet: tablet 'Network Tablet' unknown to libwacom
[135035.584] (II) event17 - Network Tablet: device is a tablet
[135035.584] (II) event17 - Network Tablet: device removed
[135035.620] (**) Option "config_info" "udev:/sys/devices/virtual/input/input26/event17"
[135035.620] (II) XINPUT: Adding extended input device "Network Tablet" (type: TABLET, id 13)
[135035.621] (II) event17 - Network Tablet: is tagged by udev as: Tablet
[135035.637] (II) event17 - Network Tablet: tablet 'Network Tablet' unknown to libwacom
[135035.637] (II) event17 - Network Tablet: device is a tablet
evemu-describe /dev/input/event17:
# EVEMU 1.3
# Kernel: 4.15.0-29-generic
# DMI: dmi:bvnAmericanMegatrendsInc.:bvrE1783IMS.113:bd01/08/2016:svnMicro-StarInternationalCo.,Ltd.:pnGT72S6QF:pvrREV1.0:rvnMicro-StarInternationalCo.,Ltd.:rnMS-1783:rvrREV1.0:cvnMicro-StarInternationalCo.,Ltd.:ct10:cvrN/A:
# Input device name: "Network Tablet"
# Input device ID: bus 0x06 vendor 0x01 product 0x01 version 0x01
# Size in mm: 218x218
# Supported events:
# Event type 0 (EV_SYN)
# Event code 0 (SYN_REPORT)
# Event code 1 (SYN_CONFIG)
# Event code 2 (SYN_MT_REPORT)
# Event code 3 (SYN_DROPPED)
# Event code 4 ((null))
# Event code 5 ((null))
# Event code 6 ((null))
# Event code 7 ((null))
# Event code 8 ((null))
# Event code 9 ((null))
# Event code 10 ((null))
# Event code 11 ((null))
# Event code 12 ((null))
# Event code 13 ((null))
# Event code 14 ((null))
# Event code 15 (SYN_MAX)
# Event type 1 (EV_KEY)
# Event code 320 (BTN_TOOL_PEN)
# Event code 330 (BTN_TOUCH)
# Event code 331 (BTN_STYLUS)
# Event code 332 (BTN_STYLUS2)
# Event type 3 (EV_ABS)
# Event code 0 (ABS_X)
# Value 0
# Min 0
# Max 65535
# Fuzz 0
# Flat 0
# Resolution 300
# Event code 1 (ABS_Y)
# Value 0
# Min 0
# Max 65535
# Fuzz 0
# Flat 0
# Resolution 300
# Event code 24 (ABS_PRESSURE)
# Value 0
# Min 0
# Max 32767
# Fuzz 0
# Flat 0
# Resolution 0
# Properties:
N: Network Tablet
I: 0006 0001 0001 0001
P: 00 00 00 00 00 00 00 00
B: 00 0b 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 01 1c 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 01 00 00 00 00 00 00 00 00
B: 02 00 00 00 00 00 00 00 00
B: 03 03 00 00 01 00 00 00 00
B: 04 00 00 00 00 00 00 00 00
B: 05 00 00 00 00 00 00 00 00
B: 11 00 00 00 00 00 00 00 00
B: 12 00 00 00 00 00 00 00 00
B: 14 00 00 00 00 00 00 00 00
B: 15 00 00 00 00 00 00 00 00
B: 15 00 00 00 00 00 00 00 00
A: 00 0 65535 0 0 300
A: 01 0 65535 0 0 300
A: 18 0 32767 0 0 0
xinput list:
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=11 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=10 [slave keyboard (3)]
↳ MSI WMI hotkeys id=12 [slave keyboard (3)]
↳ Network Tablet id=13 [slave keyboard (3)]