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
And when done, let us know the ID of the newly-created bug.
** Package changed: gnome-shell (Ubuntu) => libinput (Ubuntu)
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touchpad disable while typing, disable tap-to-click don't work in
Status in libinput package in Ubuntu:
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.
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
Date: Fri Nov 17 21:28:05 2017
InstallationDate: Installed on 2017-05-19 (182 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
UpgradeStatus: Upgraded to artful on 2017-10-20 (28 days ago)
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