Step 0 – Update and upgrade
We are using Ubuntu 16.04 LTS for this tutorial

apt-get update update the list of available packages and their versions, but it does not install or upgrade any packages. apt-get upgrade actually installs newer versions of the packages you have. After updating the lists, the package manager knows about available updates for the software you have installed.
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get upgrade
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