[ubuntu] No internet on wireless connection, but access through Ethernet

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http://ubuntuforums.org – I'm troubleshooting a network problem for an acquaintance. He's running Lucid Netbook Edition on a Thinkpad X41. A few days ago, according to him, he suddenly couldn't get online. He was at someone else's house and using their connection with no problems, then got back to his home network and couldn't connect. He can connect to his network, and if the Ethernet cable is plugged in he can get online. Two other computers running the same OS are having no problems with the wifi- I'm using it right now, actually. My computer and the Thinkpad both had the OS installed from (HowTos)