Touchpad improvements

[ryanshow]

Dell suggests a number of changes that can be made to improve the touchpad experience:

https://www.dell.com/support/article/hk/en/hkbsd1/sln308258/precision-xps-ubuntu-general-touchpad-mouse-issue-fix?lang=en

I found that the synaptics driver is not installed on ubuntu 18.04 (so there is no need to disable it), but everything else in that article is applicable, and makes the touchpad respond much better.

These steps could be included as another wrapper script.

[mike1808]

In Ubuntu > v17 the UI is Gnome and its default window manager is Wayland which uses libinput driver as default one. It is configured from Gnome. So you can download gnome-tweak-tools and configure those properties.

[ryanshow]

While that may be true, I think it would still be useful to have these settings applied during install and not after install by having to muck around with an extra tool. The purpose of this repo is to provide a great experience out of the box, after all.