Installing the guest additions (Ubuntu Guest)

This is how to install guest additions on Oracle VM Virtualbox. The below example will install guest addition to Ubuntu guest OS.

1. From the VirtualBox menu select Devices > Install Guest Additions a CDROM will appear on your desktop and give you a warning just click Cancel it’s trying to auto-run as if it was in Windows. 
2. Navigate to Applications > Accessories > Terminal.
3. Enter the following command to switch to the CDROM directory

cd /media/cdrom

4. Invoke the installer by running the following command
 
• if you have a 32bit platform

sudo ./VBoxLinuxAdditions-x86.run

        or
• if you have a 64bit platform.

sudo ./VBoxLinuxAdditions-amd64.run

5. Once the Guest Additions are installed, reboot and you will be presented with a window telling you the benefits of them. Click Ok to dismiss the window.