How to do it...

Follow the steps in the recipe to download an Ubuntu Desktop image:

In order to create a virtual machine of Ubuntu Desktop, it is necessary to first download the file from the official website: https://www.ubuntu.com/download/desktop.
As of this writing, Ubuntu Desktop 16.04.3 is the most recent available version for download.

Access the following file in a .iso format once the download is complete:
ubuntu-16.04.3-desktop-amd64.iso