My NC10 is actually running Ubuntu 8.10 at the moment, and although the Intel card was instantly recognised and appeared to run fine (it automatically connected to my network that had been set up with the original atheros chipset), for some reason it doesn’t appear to actually connect at n speed to my D-Link DIR655 and reports only 54mbps. Not sure if this is an issue with the driver or a limitation of Ubuntu itself – there seems to be remarkably little information on Wireless n in Ubuntu that I can find! Though when I do a listing of the wireless channels it has available it does list a whole raft of 5GHz ones which I thought were only in Wireless n – so not too sure!
You need to use aes encryption. Won’t go n speed until you do so. WPA2 with AES should do the job.