For me it looks like a problem in Gutenprint itself. I recommend to file a bug upstream, on http://gutnprint.sf.net/. Interim solution would be to modify the PPD file of the C50 which comes with Ubuntu, letting it be based on the PPD for the C42.
** Changed in: gutenprint (Ubuntu) Importance: Undecided => Low -- Epson Stylus C50 not printing correctly on Dapper, Edgy, & Feisty https://launchpad.net/bugs/81357 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
