Update 7/28/2019: An updated version of this guide for Ubuntu Server 18.04 LTS is now available. Feel free to check it out.
This guide will walk you through steps on how to setup a VirtualBox shared folder inside your Ubuntu Server guest. Tested on Ubuntu Server 16.04.3 LTS (Xenial Xerus)
- Open VirtualBox
- Right-click your VM, then click Settings
- Go to Shared Folders section