It is recommended that after you have successfully created the Kali Linux virtual machine using VirtualBox, you install VirtualBox guest additions. This add-on will provide you with the following additional features:

• It will enable the virtual machine to be viewed in full screen
• It will make the mouse move faster in the virtual machine
• It will enable you to copy and paste the text between the host and guest machine
• It will enable the guest and host machines to share folders

To install the guest additions, perform the following steps:

1. From the VirtualBox menu, navigate to Devices | Install Guest Additions. You will then see that the VirtualBox guest addition file is mounted as a disk.
2. The VirtualBox will then display the following message. Click on Cancel to close the window:

3. Open the Terminal console and change the VirtualBox guest additions CD ROM mount point (/media/cdrom0):

4. Execute VBoxLinuxAdditions.run to run the VirtualBox guest additions installer by typing sh ./VBoxLinuxAdditions.run, as seen here:

You may need to wait for several minutes until all of the required modules are successfully built and installed. Follow these steps to switch the VM to full-screen mode:

1. Change to the root home directory.
2. Eject the VBoxAdditions CD image by right-clicking on the icon and selecting Eject from the menu. If successful, the VBoxAdditions icon will disappear from the desktop.

3. Reboot the virtual machine by typing the reboot command in the terminal console.
4. After the reboot, you can switch to full screen (View | Switch to fullscreen) from the VirtualBox menu.