You are using kernel 3.0.0-12. This kernel is known to have broken USB printing. Please do a full system update and after that reboot your system (to actually run the kernel which will come with the updates, 3.0.0-13 or newer). The update will also include a new CUPS package with additional USB printing fixes.
You are using kernel 3.0.0-12. This kernel is known to have broken USB printing. Please do a full system update and after that reboot your system (to actually run the kernel which will come with the updates, 3.0.0-13 or newer). The update will also include a new CUPS package with additional USB printing fixes.
See bug 872711.