The problem might also involve udev, as by these lines:

[   800.429] (II) event5  - NextWindow Touchscreen: is tagged by udev as: Tablet
[   800.429] (EE) event5  - NextWindow Touchscreen: libinput bug: missing 
tablet capabilities: btn-stylus resolution.Ignoring this device.
[   800.429] (II) event5  - NextWindow Touchscreen: device is a tablet
[   800.429] (II) event5  - failed to create input device '/dev/input/event5'.

udev should recognize as TouchScreen, not Tablet.

On previous Xorgs, evdev was used, not libinput.

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https://bugs.launchpad.net/bugs/1761773

Title:
  Touch Screen stop working on 18.04 beta1

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