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[ubuntu] Internet connection not working using ethernet cable

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http://ubuntuforums.org – I am connected to the internet with an ethernet cable to a university network, no router involved. Yesterday the connection was working fine, usually after each boot I am prompted to enter a username and password to connect. Today my computer won't connect, it doesn't even get to the login screen. In Chromium it says 'Sending request' for a while then gives me the "Error 105 (net::ERR_NAME_NOT_RESOLVED): The server could not be found." error. I've tried using other working ethernet connections (which don't work) and I can tether my phone's internet connection via USB (how I'm writi (HowTos)