According to the Linux Emporium site on Linux Compatible Wireless Devices at
http://www.linuxemporium.co.uk/produ...less/#pid81764 about Belkin 802.11g 54 Mbps Wireless PCI Card it says: "The PCI and PCMCIA versions below will run 'out-of-the-box' on Ubuntu 5.10 and 6.06 (click here for documentation); the rt2570 version of the USB stick also runs on an up-to-date Ubuntu 5.10, and Ubuntu 6.06."
I don't use Ubuntu but have Kubuntu which is closely related. Both Aircrack and Kismet are available for download and install through my repositories.