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i'm newbie on ubuntu.I have a problem that i can't connect to the internet.But the wireless network are working good.

The main problem is i have internet connection but when i open up firefox its say Server not found , Firefox can't find the server

I use dualboot Windows 7 & Ubuntu 12.04.On my windows 7,the connection are just fine.Please help me, i cant wait to explore Ubuntu without any internet connection.

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Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – Jorge Castro Jun 1 '12 at 15:53
You try to connect wireless or another connection type? – ubuntufan Jun 1 '12 at 15:53
What does ifconfig output from the terminal's $-prompt? Add the output to your question. Also copy the output of cat /etc/resolv.conf to your question. – jippie Jun 1 '12 at 16:17

You should start by reviewing your wireless connection settings:

System Settings -> Network and there you could add your network name. You probably will need to define the security key to have access from Firefox.

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