[ubuntu] How to get wireless on Thinkpad X200

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http://ubuntuforums.org – I did a straight install (removed Windows) of Ubuntu 9.04 onto my Thinkpad x200. When I connect via ethernet to my wireless hub, I'm good. But when I try to connect with my LAN using the wireless connection, the machine does not recognize any LAN as available. I suspect that I don't have an appropriate driver for the Thinkpad wireless device, but then I don't know why it accepts my LAN via the hub. I'm not having much luck googling this one. Anyone have any suggestions? (HowTos)