OK. You appear to be using the synaptics touchpad driver (which is
expected in Xorg sessions after an upgrade).
I will move this bug to the synaptics driver.
In the meantime you can switch to using libinput by removing synaptics:
sudo apt remove xserver-xorg-input-synaptics
** Package changed: libinput (Ubuntu) => xserver-xorg-input-synaptics
(Ubuntu)
** Changed in: xserver-xorg-input-synaptics (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1774447
Title:
Approx. 50% of tap to clicks does not work since upgrade to Ubuntu
18.04
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