This tutorial will show you how to install Virtualbox Guest Additions on Ubuntu 13.10. I just finished installed the latest Ubuntu 13.10 Beta 2 on my Virtualbox and now I am trying to install Guest Additions on it. And this method works perfectly.
How to install Virtualbox Guest Additions on Ubuntu 13.10
1. Go to Devices | Install Guest Additions on the Virtualbox window
3. Then, enter your root password.
In few moment, system will automatically install the Guest Additions and as far as I know, there is no need to install any other packages. Ubuntu 13.10 Beta 2 will finish the installation without error. Reboot when finished and enjoy full screen of Ubuntu 13.10 Beta 2 on Virtualbox.