Operating System Security & Privacy (Windows vs Mac OS X vs Linux)First, we need administrative privileges. Sudo is not installed, we could try to install that but we'll get an error, so I'm going to su to root. Let's try again. Then we get some errors here telling us that the Guest Additions module has actually failed. So we're going to make some changes to make sure that Guest Additions is installed. Apologies for the small size, the reason the size is small is because Guest Additions isn't installed. We need to edit the source's list so you can use vi, or gedit, or whatever editors that you like use. These are the repository links where apt-get and aptitude package management tools use in order to locate and download packages. These are currently not setup correctly, so we need to change these. We don't want the CD to be active, so that needs to be changed. We don't want it to be looking for a install CD.