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With the aid of virtual machines, which are available nowadays, you don’t need to install two operating systems on the same computer, in order to do different tasks. Among the most popular programs to run virtual machines, Oracle VirtualBox is a program, which deserves special mention, as it is free, lightweight. It has almost everything, a user needs to run virtual machines. It comes with a lot of new functionalities, and can efficiently handle operating systems, developed by multiple manufacturers.

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Ubuntu Server Virtual Machine with SSH using VirtualBox on Mac OS X // under Ubuntu VirtualBox. My laptop is a late 2011 MacBook Pro running OS X 10.9 Mavericks. It's my personal laptop, so I use it for everything - browsing, e-mail, and programming.
For information on this, have a look here: Lifehacker 'How to Run Mac OS X Inside Windows Using VirtualBox'. Ignore the fact that they are using VirtualBox in Windows, because the same process will work in Ubuntu too.

But, due to some system limitations on older operating systems, you might not get the advantage of numerous new features, which might be offered by your computer hardware. In such cases, Oracle came with a solution of Extension Pack for VirtualBox, which can be installed, in order to get the extra hardware functionalities, which is present on your computer. The VirtualBox extension Pack is platform independent, which means you can install it on any of the existing operating systems, provided VirtualBox is installed on your computer.

By default, each virtual machine has a directory on your host computer where all the files of that machine are stored: the XML settings file, with a.vbox file extension, and its disk images. This is called the machine folder. By default, this machine folder is located in a common folder called VirtualBox VMs, which Oracle VM VirtualBox creates in the current system user's home directory.

How to install VirtualBox extension Pack on any platform running VirtualBox

Wait, do you need it!

Before proceeding with the installation of extension pack for your VirtualBox, it is recommended that you check, whether you need it.

The extension Pack comes with support for USB 2.0 and 0, which can be helpful, if you are having a new computer, and want to use those ports with maximum potential, within your guest operating system, while using VirtualBox.
The extension Pack also come with Intel PXE Boot ROM, which is the abbreviation of Pre-Boot Execution Environment, and you will need that while making your guest operating system boot from the network.
If you need nativedisk encryption features, on your guest operating system, you can also get the feature with the Extension Pack. Apart from the three most important features, which you can get, you can also get bonus functionalities, which include VirtualBox RDP, NVMe features and many more.

In most of the cases, the features, which are mentioned here, are not necessary for normal users, and thus, it is not present in the default package of VirtualBox. But if you are a developer, and you really need those functionalities, you should not think once again before you download and install a VirtualBox Extension Pack.

Downloading and installing the extension Pack on all platforms

Downloading the extension Pack for VirtualBox

Step 1: Visit the official website of VirtualBox, which is https://www.VirtualBox.org/, and click on “Downloads” on the left panel of the webpage.

Step 2: Find out VirtualBox Extension Pack, and click on the link, which says “All Supported Platforms”, in order to start downloading the extension Pack directly.

You can also click on the following link, https://download.VirtualBox.org/VirtualBox/5.2.6/Oracle_VM_VirtualBox_Extension_Pack-5.2.6-120293.vbox-extpack, to start downloading the Extension Pack without going through all the above steps.

Installing the extension Pack for VirtualBox on Windows, Mac OS, and Ubuntu Linux

Step 1: Locate the downloaded file, and it will come with the extension “.vbox-extpack”. Double click on the file.

Step 2: A new window will open, asking you, whether you want to install the Extension Pack for VirtualBox. Just click on “Install” to start installing the Extension Pack.

Step 3: Scroll down to the end of the Terms and Conditions page and click on “I agree”.

After successful installation, you get a message as shown in the below screenshot…

Installing the extension pack on VirtualBox Portable

Note: The Portable VistualBox is only available for Windows machine. So, if you are running on Windows 10, Windows 8 or Windows 7 then only you can follow or use the Extension pack on Portable VirtualBox.

Installing the Extension Pack on a portable version can be a little tricky, but you should know the correct method to do it.

Step 1: Open VirtualBox Portable and click on “File”

Step 2: Click on “Preferences”, which will possibly the first on the list.

Step 3: In the “Preferences” window, go to “Extensions”.

Step 4: On the right side of the window you can find “Adds New Package”. Click on that.

Step 5: Locate the VirtualBox Extension Pack, with the extension “.vbox-extpack”.

Step 6: Click on Install, Accept the “Terms and Conditions”, and the installation will start.

The installation will take hardly a few seconds, though it depends upon your system. Click on “OK” to finalize the installation. Once the installation is complete, you can easily configure your existing or new guest operating systems to take advantage of the extension Pack, by using all the latest features, which are available.

How to Remove or Uninstall Oracle VirtualBox Extension Pack

The above method to install Extension Pack on VirtualBox is not only limited to portable editions, but it also works perfectly on other editions. The following method can even help you to remove any old or unused Extension Pack.

Step 1: Click on File from the Virtualbox Menu and select the Preferences option.

Step 2: Select the Extension option and just select the package you want to uninstall.

Step 2: Click on cross icon to Remove Selected Package.

Step 3: Click on “Remove”, in the new window, which appears and you are done…

A final note on Oracle VM VirtualBox extension pack

As the VirtualBox extension Pack comes with the file extension “.vbox-extpack”, you should keep VirtualBox installed on your computer, to install the Extension Pack. In case you’re not having VirtualBox, the Extension Pack will not be recognized by your operating system.

SEE:

In Oracle VM VirtualBox, a virtual machine and its settings are described in a virtual machine settings file in XML format. In addition, most virtual machines have one or more virtual hard disks. These are typically represented by disk images, such as those in VDI format. The location of these files may vary, depending on the host operating system. See Section 3.1.1, “The Machine Folder”.

Global configuration data for Oracle VM VirtualBox is maintained in another location on the host. See Section 3.1.2, “Global Settings”.

By default, each virtual machine has a directory on your host computer where all the files of that machine are stored: the XML settings file, with a .vbox file extension, and its disk images. This is called the machine folder.

By default, this machine folder is located in a common folder called VirtualBox VMs, which Oracle VM VirtualBox creates in the current system user's home directory. The location of this home directory depends on the conventions of the host operating system, as follows:

On Windows, this is the location returned by the SHGetFolderPath function of the Windows system library Shell32.dll, asking for the user profile. A typical location is C:Usersusername.
On Linux, Mac OS X, and Oracle Solaris, this is generally taken from the environment variable $HOME, except for the user root where it is taken from the account database. This is a workaround for the frequent trouble caused by users using Oracle VM VirtualBox in combination with the tool sudo, which by default does not reset the environment variable $HOME.
A typical location on Linux and Oracle Solaris is /home/username and on Mac OS X is /Users/username.

For simplicity, we abbreviate the location of the home directory as $HOME. Using that convention, the common folder for all virtual machines is $HOME/VirtualBox VMs.

As an example, when you create a virtual machine called 'Example VM', Oracle VM VirtualBox creates the following:

A machine folder: $HOME/VirtualBox VMs/Example VM/
In the machine folder, a settings file: Example VM.vbox
In the machine folder, a virtual disk image: Example VM.vdi.

This is the default layout if you use the Create New Virtual Machine wizard described in Creating Your First Virtual Machine. Once you start working with the VM, additional files are added. Log files are in a subfolder called Logs, and if you have taken snapshots, they are in a Snapshots subfolder. For each VM, you can change the location of its snapshots folder in the VM settings.

You can change the default machine folder by selecting Preferences from the File menu in the Oracle VM VirtualBox main window. Then, in the displayed window, click on the General tab. Alternatively, use the VBoxManage setproperty machinefolder command. See VBoxManage setproperty.

In addition to the files for the virtual machines, Oracle VM VirtualBox maintains global configuration data in the following directory:

Linux and Oracle Solaris:$HOME/.config/VirtualBox.
Windows:$HOME/.VirtualBox.
Mac OS X:$HOME/Library/VirtualBox.

Oracle VM VirtualBox creates this configuration directory automatically, if necessary. You can specify an alternate configuration directory by either setting the VBOX_USER_HOME environment variable, or on Linux or Oracle Solaris by using the standard XDG_CONFIG_HOME variable. Since the global VirtualBox.xml settings file points to all other configuration files, this enables switching between several Oracle VM VirtualBox configurations.

In this configuration directory, Oracle VM VirtualBox stores its global settings file, an XML file called VirtualBox.xml. This file includes global configuration options and a list of registered virtual machines with pointers to their XML settings files.

The following table gives a brief overview of the configuration data locations on an Oracle VM VirtualBox host.

Table 3.1 Configuration File Locations

Setting	Location
Default machines folder	`$HOME/VirtualBox VMs`
Default disk image location	In each machine's folder
Machine settings file extension	`.vbox`
Media registry	Each machine settings file Media registration is done automatically when a storage medium is attached to a VM

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Oracle VM VirtualBox uses XML for both the machine settings files and the global configuration file, VirtualBox.xml.

All Oracle VM VirtualBox XML files are versioned. When a new settings file is created, for example because a new virtual machine is created, Oracle VM VirtualBox automatically uses the settings format of the current Oracle VM VirtualBox version. These files may not be readable if you downgrade to an earlier version of Oracle VM VirtualBox. However, when Oracle VM VirtualBox encounters a settings file from an earlier version, such as after upgrading Oracle VM VirtualBox, it attempts to preserve the settings format as much as possible. It will only silently upgrade the settings format if the current settings cannot be expressed in the old format, for example because you enabled a feature that was not present in an earlier version of Oracle VM VirtualBox.

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In such cases, Oracle VM VirtualBox backs up the old settings file in the virtual machine's configuration directory. If you need to go back to the earlier version of Oracle VM VirtualBox, then you will need to manually copy these backup files back.

We intentionally do not document the specifications of the Oracle VM VirtualBox XML files, as we must reserve the right to modify them in the future. We therefore strongly suggest that you do not edit these files manually. Oracle VM VirtualBox provides complete access to its configuration data through its the VBoxManage command line tool, see VBoxManage and its API, see Chapter 4, Oracle VM VirtualBox Programming Interfaces.