Install VirtualBox:

Download
Installing VirtualBox in either Windows or Linux is similar to other program installs.

Configure the VirtualBox Container:

Install VirtualBox Guest Additions (optional):

In the VirtualBox menu click Devices->Insert Guest Additions CD.
sudo apt-get update
sudo apt-get install -y dkms build-essential linux-headers-generic linux-headers-$- (uname -r)
sudo mount /dev/cdrom /cdrom
cd /cdrom
sudo ./VBoxLinuxAdditions.run