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I just upgraded from Ubuntu 9.10 to 13.04. As soon as I logged in, the system announced I was no longer connected to the network, and I can't figure out how to connect. I'm using an ethernet cable, so there's no wireless stuff to deal with - and it had no trouble connecting the whole time it was upgrading. Does anyone know how to turn the network connection back on?

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This usually has to do with incorrect configuration in your /etc/network/interfaces. Try commenting everything except "lo" (local) interface on the first line. –  Prahlad Yeri Jun 23 '13 at 7:06
    
I tried that, thought there's only one line other than "auto lo", but I don't have permissions to change it, although I should have admin privileges. I don't know how to get to a console in Ubuntu to try it. –  Hugh Jul 9 '13 at 2:15
    
I made the change, so the only un-commented line in the file is now "auto lo". It no longer says it's disconnecting from the network, but neither is it connecting. –  Hugh Jul 9 '13 at 5:34
    
How do you deduce that the network is down? Did you try "ping localhost"? If you want to set static-ip for the ethernet adapter, then try configuring that in the /etc/network/interfaces and check. But usually, the network-manager should take care of this for you. –  Prahlad Yeri Jul 9 '13 at 6:21

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