I experienced this problem when doing a *clean installation* of Ubuntu
GNOME 16.04.3.  I confirmed that the synaptics driver was in use.  apt-
get update; apt-get upgrade did not resolve the problem.

I was able to get the touchpad settings working by uninstalling the
synaptics driver and installing libinput.  I had to upgrade a held-back
dependency in order to do this, and I'm not sure if the result was
entirely kosher.

It seems like a clean installation should not have this problem, nor is
it clear to me how the synaptics support got dropped in Ubuntu GNOME
16.04.3 when the upstream version affected was 3.20, and 16.04.3 is
still documented as including GNOME 3.18.  I can understand how these
kinds of issues can occur in an upgrade to a new major version such as
17.10, but it's really a big boo-boo to have this sort of breakage in
the routine updates to an LTS release.  It would at least be helpful to
mention this issue in the release notes for UG 16.04.3.

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  If -synaptics is installed, GNOME Mouse & Touchpad Settings doesn't

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