$ sudo apt install xserver-xorg-input-synaptics-hwe-18.04
Link 1 (http://www.upubuntu.com/2016/11/laptops-touchpad-not-working-on-ubuntu.html)
Link 2 (https://answers.launchpad.net/ubuntu/+question/678600)
$ sudo apt install xserver-xorg-input-synaptics-hwe-18.04
Link 1 (http://www.upubuntu.com/2016/11/laptops-touchpad-not-working-on-ubuntu.html)
Link 2 (https://answers.launchpad.net/ubuntu/+question/678600)