I have a friend that is really wanting to get running with Ubuntu 9.04 (preferably 64-bit edition), however his built in wireless card is horribly unstable and I have been unable to get it working with ndiswrapper or by any other means.

He has been asking about getting a Wireless-N adapter to replace his onboard card and I would like your recommendations for a good wireless-N usb or pcmcia adapter that works out of the box in Ubuntu 9.04.

Thank you all in advance, you input and recommendations are appreciated.