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I am new to Ubuntu. After installing Ubuntu 12.04 my wireless network is not connecting. It is asking password every few seconds, but the same password is working for other laptop and even mobile device.

I am using Toshiba NB505 and the wi-fi is from my office network.

How to resolve this issue? I am unable to do anything without wi-fi.

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Follow the steps in this answer. If it doesn't work, open a terminal (Ctrl+Alt+T) and type sudo service network-manager restart and hit enter, and try connecting again to WiFi. And if it does not work, try this answer. If any of these solved your issue, let us know which one did. –  Alaa Jul 16 '13 at 5:32
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