Posted by: Gohtalo December 29, 2010
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1)Make sure you have correct drivers installed following the commands posted by other users above
2)Sometimes and wireless is disabled from the software level and I think that is bug in earlier version of ubuntu 10.x.So open this file in Vi nano pico or any editor
/var/lib/NetworkManager/NetworkManager.state
Ex:sudo nano /var/lib/
and there are three flags there so turn on this flag to true
NetworkingEnabled=true
3)Use have to save the file and restart the machine to make this configuration changes.
Don't switch the hardware wireless on and off switch in the process.
This problems frequently when you trun off computer during cold boot so have to do again and again.
Hope that helps
Also try Wifi Rader Wicd tools that might help you connect wireless better.