Fix twitchy/wobbling touchpad for Ubuntu based distributions

On two occasions I have experienced that my Dell Latitude laptops has twitchy touchpads. This has happened on both Ubuntu 18.04 and elementaryOS 0.4 some years ago.

The fix, so far, has simply been to reinstall the xserver driver plus some additional software:

sudo apt remove xserver-xorg-input-libinput

sudo apt install xserver-xorg-input-all xserver-xorg-input-evdev xserver-xorg-input-synaptics

Then reboot computer.

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