As I’m a Mac, Parallels and Ubuntu user, I have a parallel partition with Ubuntu inside. In parallels, we can specify “Share” or “Bridged” Networking. If you choose “Bridged”, you IP will be appear like a dedicated computer so other users inside your network can access with different IP. However, the problem is when you upgrade or update sources in ubuntu, you’ll get “Waiting for header” which will make you prevent from accessing to sources. That problem can be solved if you switch your networking setting from “Bridged” to “Share” in Parallel.