How to install Guest OS Additions (Linux guestOS) in VirtualBox

1. Mount the Guest OS Additions image file (ISO).

2. Open up a terminal, go to /media, and see if the image has been mounted successfully.

jayla@jayla-VirtualBox:/media/VBOXADDITIONS_4.3.10_93012$

3. Run the relevant script

sudo sh ./VBoxLinuxAdditions.run

4. Guest OS Additions should be installed in folder /opt/VBoxGuestAdditions-4.3.10

For more details, go to the official VirtualBox site

https://www.virtualbox.org/manual/ch04.html