Same on Feisty Fawn Herd 4 with HP Photosmart C3180. I think the best would be list it only once, use hp by default and allow to change to usb in the Properties window once installed.
** Attachment added: "Screenshot of the printer listed twice" http://librarian.launchpad.net/6566606/Captura-Afegeix%20una%20impressora.png -- Duplicate printers listed when adding HP printer https://launchpad.net/bugs/32302 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
