That is actually caused by the AppArmor profile that ships with CUPS. It prevents changing the output directory without also altering the AppArmor profile, in addition to cups-pdf.conf options. This is already explained in /usr/share/doc/cups-pdf/README.Debian
That is actually caused by the AppArmor profile that ships with CUPS. It prevents changing the output directory without also altering the AppArmor profile, in addition to cups-pdf.conf options. This is already explained in /usr/share/ doc/cups- pdf/README. Debian