Your PPD is broken. It has the header of a globalized PPD (with "*cupsLanguges" entry) but in reality it is a single-language PPD for French, and especially the French strings are UTF-8 encoded but the "*LanguageEncoding:" keyword says "ISOLatin1". How did you obtain this PPD? The PPDs generated by the Ubuntu package of Gutenprint are globalized PPDs according to the CUPS extensions on http://www.cups.org/documentation.php/doc-1.4/spec-ppd.html.
Your PPD is broken. It has the header of a globalized PPD (with "*cupsLanguges" entry) but in reality it is a single-language PPD for French, and especially the French strings are UTF-8 encoded but the "*LanguageEncod ing:" keyword says "ISOLatin1". How did you obtain this PPD? The PPDs generated by the Ubuntu package of Gutenprint are globalized PPDs according to the CUPS extensions on http:// www.cups. org/documentati on.php/ doc-1.4/ spec-ppd. html.