Wireless ICS network without a router

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http://www.linuxquestions.org – I have a desktop running Ubuntu 9.10 with a D-Link WUA-1340 (Supported - last on list) USB wireless adapter, through which I would like to set up a wireless network for internet connection sharing at home. I have 2 ethernet adapters on my desktop (Eth0, Eth1), and an Apple Airport Express, which I initially tried to use, then thought it might be better to just bypass the Airport Express. I have worked through a couple tutorials for this on the Ubuntu forums: InternetConnectionSharing WifiDocsShareEthernetConnectionThroughWireless WifiDocsAdhoc My problem is that although I create a wireless network and connect to it with my macbook, I am unable to access the Internet on it. Any troubleshooting advice would be appreciated. I am not sure what I am doing wrong, and have worked through WifiDocsShareEthernetConnectionThroughWireless a few times, as this seems to be exactly what I am trying to do. I am quite new to networking, so any other reference points that you feel may be beneficial would also be appreciated. Thank you. (HowTos)