I'm running Ubuntu on a VirtualBox Virtual Machine, and I'm downloading a large file on this virtual machine. This download would take more than 30 minutes, so I would like to minimize VirtualBox and continue working on my primary system. But when I minimize VirtualBox, then the virtual machine actually pauses and then the download also pauses. How can I make sure that VirtualBox doesn't pause my virtual machine when VirtualBox is minimized? I'm using VirtualBox 4.2.16.