Install Virtualbox 5.x on Ubuntu 14.04 Trusty (no X11)

[peter_b]

Generic instructions can be found on the virtualbox.org download wiki page.

1) Add the repository:
Copy/paste the following line to "/etc/apt/sources.list.d/virtualbox.list":

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deb http://download.virtualbox.org/virtualbox/debian trusty contrib

2) Add Oracle's GPG key:

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$ wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -

3) Update APT package list:

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$ apt-get update

4) Install Virtualbox 5 package:
By default, the virtualbox package from Oracle would automatically try to install an X11 server (for GUI).
Since I'm running things on a headless server machine, I want to avoid having graphics running.

For this, I add "--no-install-recommends", so it only installs mandatory dependencies:

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$ apt-get install virtualbox-5.0 --no-install-recommends

(Thanks to RNS wiki for the "No-X11" flags)

That's it.
You're done