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I have installed Ubuntu 12.04-desktop by using wubi on my PC. But there is something wrong with the network.

I share the network with my roommate by wifi. Now if I connect to the Internet, my roommate's compute (Windows 7, 32bit) can't even connect to the router.

Why does this problem occur and how to solve it?

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Do you get anything meaningful in your system's log files? A snippet out of /var/log/messages from around the moment you connected might reveal something. –  tripleee Jul 16 '13 at 7:24
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