Sorry for the late reply. On your Ubuntu (or other *nix) box:
-Install OpenSSH
-Port forward TCP port 22 on your router to the box
-Set the computer's IP address to a static IP outside of your DHCP range

Then, pick the .cap file that exists in ~/MyDocs/FAS/cap/WPA

The command on your N900 would be:
scp ~/MyDocs/FAS/cap/WPA/some_network.cap [username]@[external_IP_Address]:~/Desktop

That puts it on the Desktop of your linux box. Then, I use aircrack-ng with the "-w" option for a wordlist. I have been making my own wordlists but that's because I know the "2Wire" networks in my area just use numbers and are a certain length long. You would want to do how fAircrack does it and send the output of John The Ripper or something as the input to aircrack-ng.