I copied the /usr/lib/cups/filter/pstops file to pstoxeroxps and that worked for me when using the printer in AppSocket mode. Response to: <pre>I just showed up on a job and I need to beable to bring to a Xerox Phaser 7750DN. The default Ubuntu Hoary install didn't have a ppd file for the printer, but Xerox offers a set of ppd's on their website, including one of the 7750DN. I set everything, up and all seems great until I print. The job never goes through, the cups error_log has a reference to pstoxeroxps not being found, in the ppd file this is listed as a cups filter. I've searched the net for pstoxeroxps, with absolutely no luck luck, no hits in google web or google groups. I switch to a generic print dirver and I get a test page to print, but have issues with tray handeling and some color correction that I think are in the xerox ppd. Anyone have any thoughts, expecially about the mysterious pstoxeroxps stuff? Thanks.</pre>