I have a machine using Ubuntu 14.04 that is fine, and I use it constantly as a media server. I have a seldom-used tablet running Ubuntu which I would like to use for some Kahn Academy PHP programming, and perhaps learn how to use an API I have access to. The second machine was originally set up with 14.40, then without my request updated to Ubuntu 15.04. Now I can connect to it using TightVNC, and I can ping it from my (Windows) desktop. But it will not access the internet; "Server not found." I found numerous Google hits with others having the exact problem with Ubuntu 15.04, but the solutions were beyond my personal skill set. Generally they recommend to perform some sort of service or utility, but I need step by step "Type this, then that" level of instruction. I posted this once and the posting got accidentally cancelled, so putting it back up. Previously, there was an opinion that my DNS service was not properly set up, but no instruction how to do so. If this turns out to be really complex, I guess I would entertain just wiping the system and starting over with a fresh install of Ubuntu 14.04.