Installing a printer without a ppd file

I am trying to set up a computer linux to be able to print from my printer: Brother DCP 7030. But (twist!) for security reasons this computer should never go online. So any software I need to install will need to be downloaded with another machine, put in a usb stick, and copied onto the linux machine. Sweet. The operating system is Ubuntu 12.04 LTS (not sure what does it mean). OS type: 32-bit. Now the system seem to only accept PPD files as printer drivers. While Brother does not offer any ppd file for this printer (I tried the 7025 and 7045, but they don't work). http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/download_prn.html#DCP-7030 What should I do?