Ubuntu 12.04 wired internet connection no longer works

My solution:
Right-click on the "network manager" applet icon on the top of the ubuntu panel.


Select "Edit connection". Delete the respective entry under the "Wired" tab.


Then depending on your connection type, you may be able to have the connection auto-detected. In that case, click on the "network manager applet icon again and select that auto-detected item (e.g. Auto ethernet). Then it is suddenly all set.

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