Solved after deleting custom installation of lib-wacom and then
installing xserver-xorg-input-wacom, libwacom2, and libwacom-common.
Showing on the settings page after rebooting.
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Reporting the bug from ubuntu 18.04.4 LTS. The tablet works and the
pointer moves as expected but the settings->devices->wacom configuration
does not recognize the tablet. Also, I report this same tablet and same
computer was working properly before, but not sure if it was on 18.04 or
19.something