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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774447 Title: Approx. 50% of tap to clicks does not work since upgrade to Ubuntu 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/1774447/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs