Fix for Dell Touchpad Two-finger Scroll Stops Working After Waking from Sleep / Suspend (Ubuntu 20.04)

This is the basic fix...

sudo modprobe -r hid_multitouch
sudo modprobe hid_multitouch

I created this file...

sudo vim /lib/systemd/system-sleep/psmouse-refresh

And in it I put this...

#!/bin/bash

# $1 is the state (pre or post)-sleep
if [[ $1 == post ]]; then
    sudo modprobe -r usbhid
    sudo modprobe -r psmouse
    sudo modprobe -r hid_multitouch
    sudo modprobe psmouse
    sudo modprobe usbhid
    sudo modprobe hid_multitouch
fi