[ubuntu] Can't activate wlan0

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http://ubuntuforums.org – Hi, I have got an asus 1201n and i installed Ubuntu 9.04 on it. Now i tried to get wireless working. After a while i found that bug on launchpad. i followed the instructions there and after i copied the driver into the right place it showd me wlan0 if used ifconfig -a but it seems not to work correctly. It doesn't display any wireless network. if i try to bring it up it says me: Code: sudo ifconfig wlan0 up [sudo] password for bgaechter: (Hardware)