Hello everyone,

after much struggling, I have managed to install the iPrint client and the printer I need on ubuntu linux. Now the printer I'm using needs authentication, and whenever I print a website from Firefox, the plugin seems to intercetp the job and ask me for authentication, which works fine.

When I print from any other application though (Acrobat Reader, OpenOffice etc), the authentication dialog doesn't show up and the print job fails: In the CUPS overview, it says:

held since
Sun 17 Oct 2010 21:32:29 BST
"/usr/lib/cups/backend/ipp failed"

How can I resolve or work around this problem?

any help much appreciated.