I tired your lines and the printer warms up but nothing prints. The LCD goes from "warming up" to "waiting".
I filed a bug in Ubuntu : https://bugs.launchpad.net/ubuntu/+source/cups/+bug/374416
The first part of this entry relates to communication difficulties which have been solved between Ubuntu 9.10 and 10.10. The second part (starting with comment #31) is related to this file which I sent you.
My long understanding was that it was necessary to have two queues. Print B&W on the B&W queue, print color on the color queue. This results from my experiments that printing a color page on the B&W queue would lead to no print.
Lately, I narrowed the problem to the print_fail.pdf document which neither prints on the B&W nor on the color queue.
Viewing my previous entry on this forum from 3 years ago, I conclude that this was a longstanding issue on Ubuntu, since I have changed my computer several times and installed 7 ubuntu releases.