Comment 4 for bug 990734

Fresh install of 12.04 with local usb hp1600 printer which works for local prints.
Enabled sharing for this printer but it stated not published so I used http://localhost:631 admin and ticked share.
The printer was then visible on the network to another 11.10 and 12.04 Ubuntu system.

Cannot print from 11.10 Ubuntu system to this 12.04 using the network printer that appears in the list automatically.
the resulting message on the 12.04 hosting the printer was:-

E [04/May/2012:15:19:18 +0100] Returning IPP client-error-document-format-not-supported for Print-Job (ipp://192.168.1.111:631/printers/HP-Color-LaserJet-1600) from 192.168.1.101

Using the network printer that appears automatically in the fresh 12.04 install that does not have the printer attached locally also doesn't work. This printer is found via the DNS-SD system.
Print status as Processing - Not connected?
and cups error_log on that machine states The printer is not responding.

But adding the printer on the 12.04 client system via:-
Add - expand "Network Printer"
ignore the advertised network printer (the DNS-SD one)
- Find Network Printer - and enter the ip address of the 12.04 system hosting the usb printer and clicking the find button.
-- result is a straight ipp address.
--- forward button and changed name and resulting network printer work just dandy.

summary
cant print from 11.10 to 12.04 via ipp
can print from 12.04 to 12.04 via ipp but not if I used the initially supplied dns-sd address.

hope this helps.