Plank is my favorite docking on Linux. This tutorial will guide you through the installation of Plank on Ubuntu 16.04 Xenial Xerus. There is a PPA repository for Plank, so Ubuntu users can easily install it.
First, add the Plank PPA to Ubuntu 16.04
Open Terminal and paste this command below:
sudo add-apt-repository ppa:docky-core/stable
Update system
sudo apt-get update
Finally, install Plank
sudo apt-get install plank
Done. Now, run Plank from Ubuntu Unity Launcher.