I suggest a workaround might be to:
1. sudo apt install xserver-xorg-input-synaptics
2. Only log in to "Ubuntu on Xorg", so now you're avoiding libinput completely.
3. Tweak your settings with 'synclient'.
Since this sounds like a problem specifically with libinput, please help us to progress this issue by reporting it upstream to the libinput developers here:
Jonathan,
I suggest a workaround might be to: xorg-input- synaptics
1. sudo apt install xserver-
2. Only log in to "Ubuntu on Xorg", so now you're avoiding libinput completely.
3. Tweak your settings with 'synclient'.
Since this sounds like a problem specifically with libinput, please help us to progress this issue by reporting it upstream to the libinput developers here:
https:/ /bugs.freedeskt op.org/ enter_bug. cgi?product= wayland& component= libinput
And when done, let us know the ID of the newly-created bug.