FIXED: See post #9 of this thread.
I have a somewhat normal computer setup. All mentioned hosts are in the same network.
- Delta [Ubuntu 13.04] connected to printer through USB. Is capable of directly printing. I ticked the share printer in the cups main screen and I ticked the share this printer for this specific printer.
- Alpha, Gentoo box with CUPS server. Picks up printer from delta without a problem, until I upgraded to 13.04.
I also share the printer with avahi-daemon (script). That is one briliant piece of work. With Linux, you can actually trick Ipad's into thinking they are talking to an Airport printer. The printer is an old HP PSC2355p and we did not pay the 100 euro markup for it so we can print with an Apple device . This functionality requires avahi-daemon which is installed on Delta. Presumably, this mechanism worked fine along the (by now, obsoleted) printer sharing mechanism CUPS is using.
However, since I upgraded from 12.10 to 13.04, the CUPS sharing mechanism stopped working. Here is the deal, Delta can print. The Ipad can print. But Alpha cannot. The printer will not show up. I did not change my configuration between 12.10 and 13.04.