I've had the similar problems and now it seems to work. I don't know if the problem was my typo or Gnomes printer configuration tools, but the user password in printers.conf was replaced by the detected connection name of the printer connected to. Some nanoing with the config file and restarting cups afterwards fixed it. THANK YOU!
-- cups smb printing backend no longer works https://launchpad.net/bugs/39484 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs