Installed GNOME shell - no change.
The hardware (Samsung n-130) cannot handle 64-bit.
On Kubuntu 18.04 beta, if tap-to-click is enabled the same behaviour
occurs: the touchpad appears to be intermittently unable to
differentiate between a single finger tap and a two finger tap when
single finger tapping; it does not have the reverse problem, two finger
taps are never mistaken for single finger taps. Occasionally the
secondary context menu appears when merely moving the pointer.
As I generally don't use tap-to-click for right click (two-finger-tap)
it struck me that if I could turn off two finger tapping or change the
response to a two finger tap from right to left click using the libinput
settings I would be able to effectively avoid the problem. I know it is
possible to change the response to 1,2,3 clicks from l,r,m to l,m,r but
don't know if it's possible to change it to l,l,l.
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Random right click behaviour with synaptics touchpad
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