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I use a 3G Modem to connect to the internet. When I connect this modem I can browse, can download anything from the internet and even use apt-get without any problem.

But the problem is somehow Network Manager can't understand that I have an active wireless network connection. For this reason I can't download anything from Ubuntu Software Center as it shows that I have no internet connection. Also I can't use VPN for this reason.

What's the problem?

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What's your hardware? Which Ubuntu version do you use? –  user85164 May 2 '13 at 18:49
    
I am using Ubuntu 12.10. which hardware? –  Ashfaqur Rahman May 4 '13 at 17:05
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