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My computer is connected to the internet via mobile broadband. But when opening Ubuntu Software Center and want to read reviews it says no network connection, connect to the internet to see more reviews although I can install application without problem.

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Check your software sources ( Edit -> Software Sources...") – Rrjrjtlokrthjji Jun 19 '13 at 19:16
i did that before, but still nothing – user159138 Jun 21 '13 at 10:30

What if you directly browse to the underlying URL, e.g. ?

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better if it would be working inside the app rather than going to the web then come back to software center for installation – user159138 Jun 19 '13 at 18:26
I was not suggesting that this is your permanent solution, rather a way to find out if that URL is somehow inaccessible from your computer (a DNS issue, bad proxy, etc). – Nate from Kalamazoo Jun 19 '13 at 18:30

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