# Install VirtualBox 5.1 guest additions on Ubuntu server guest
Have tested these instructions successfully under an Ubuntu 16.04LTS guest:

- Create Ubuntu server instance under VirtualBox (obviously).
- Start VM, goto **Devices - Insert Guest Additions CD image** to mount the ISO image.
- From the terminal, run the following commands:

	```sh
	$ sudo su
	$ apt install gcc make
	$ mkdir -p /media/cdrom
	$ mount /dev/cdrom /media/cdrom
	$ /media/cdrom/VBoxLinuxAdditions.run
	$ reboot
	```

- After reboot:

	```sh
	$ sudo usermod --append --groups vboxsf USERNAME
	```

- Host shares should now be mounted in Ubuntu guest under `/media` via the installed `VBoxService` service, set to start on system boot-up.
- All done