Install VirtualBox on Ubuntu 16.04 LTS to run Windows 10 Insider Preview

VirtualBox package in Ubuntu 16.04 LTS does not successfully install Windows 10 Insider Preview. To install, you need to install VirtualBox from the Oracle website at this link:
https://www.virtualbox.org/wiki/Linux_Downloads

As instructed on that site:

Open a terminal window and add the following line to the /etc/apt/sources.list file:
$ sudo vi /etc/apt/sources.list <enter>
deb http://download.virtualbox.org/virtualbox/debian xenial contrib
:wq

Add the public key with:
$ wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add - <enter>

Then install VirtualBox 5.1 by:
$ sudo apt-get update <enter>
$ sudo apt-get install virtualbox-5.1 <enter>

Run VirtualBox.

Download VirtualBox Extensions Pack from Oracle
$ wget - c http://download.virtualbox.org/virtualbox/5.1.24/Oracle_VM_VirtualBox_Extension_Pack-5.1.24-117012.vbox-extpack <enter>

Install the VirtualBox Extensions Pack from Oracle:
File -> Preferences -> Extensions
Select the add button

Choose the extensions file downloaded as previously stated and it will get installed.

Exit VirtualBox and restart it. You are now ready.

Settings during Windows 10 Insider Preview installation on VirtualBox
System -> Motherboard check Enable I/O APIC, Acceleration -> Hardware Virtualization, select Enable VT-x/AMD-V and Enable Nested Paging.

System -> Motherboard Chipset = ICH9

Create a Hard Disk as Fixed and not Dynamic to save time during installation.
Size about 25GB.