In the case above , Krita is able to detect mouse stroke but is not able to detect the pressure sensitivity(brush stroke almost invisible) of the drawing tablet ,making the tablet completely unusable.
It is evident from this that the machine's hardware is able to process the mouse stroke without pressure sensitivity but with pressure sensitivity , is not able to compute the brush stoke of the drawing tablet.
Inorder to make krita recognise atleast the tablet stroke (if not, pressure sensitivity),the pressure sensitivity has to be disabled for all input devices on this machine.This can be done by setting the pressure sensitivity[Krita4.2-Settings-Configure Krita-Tablet Settings] for low pressure to "1" from it's default "0" value.
(Note that this change is going to render the pressure sensitivity on the tablet unusable but the brush stoke will render on the canvas.)