Jonathan,

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:

https://bugs.freedesktop.org/enter_bug.cgi?product=wayland&component=libinput

And when done, let us know the ID of the newly-created bug.

** Package changed: gnome-shell (Ubuntu) => libinput (Ubuntu)

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https://bugs.launchpad.net/bugs/1733032

Title:
  touchpad disable while typing, disable tap-to-click don't work in
  17.10

Status in libinput package in Ubuntu:
  Confirmed

Bug description:
  Since upgrading to 17.10, my mouse pointer is repeatedly and
  frequently getting moved against my will when I am typing on my laptop
  keyboard (as opposed to external keyboard) because my hand brushes
  against the touchpad or even just near its surface.

  Furthermore, I don't want tap-to-click to be enabled. I want to
  actually have to push down on the mousepad hard enough to click it to
  generate a mouse button event. I can't figure out how to disable tap-
  to-click in 17.10 either.

  I did not have these problems _at all_ in 17.04.

  I have the touchpad click method set to "Areas" and "Disable While
  Typing" enabled in gnome-tweak-tool. This does not help.

  I have these lines in the touchpad section of
  /usr/share/X11/xorg.conf.d/40-libinput.conf as well:

  Option "DisableWhileTyping" "true"
  Option "PalmDetection" "true"
  Option "Tapping" "false"

  They don't help either.

  This is a substantial regression in functionality from 17.04.

  It appears to be a problem using both Wayland and Xorg.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.1-0ubuntu5
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov 17 21:28:05 2017
  DisplayManager: gdm3
  InstallationDate: Installed on 2017-05-19 (182 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to artful on 2017-10-20 (28 days ago)

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