I want to upgrade from Ubuntu 10.10 to 11.04. When I start upgrading, a window appeared with the following message:
authentication failed there may be a problem with the network or with a server
Please guide me on how can I resolve this problem.
I bought a Samsung series 5 notebook and a very strange thing happened: I installed Ubuntu 11.10 from a usb pen drive but when I restarted (...
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