Comment 3 for bug 127707

I had the same problem running airport2-config under Hardy. In order to use the workaround posted by derjohn, you will first need to install the Java 5 jre:

sudo apt-get install sun-java5-jre

Then you can run the configurator manually, as he posted:

/usr/lib/jvm/java-1.5.0-sun/bin/java -jar /usr/share/java/airport-utils/AirportBaseStationConfig.jar

This worked for me.