Had this issue on hardy, found this bug - thought I'd share my solution.
In /etc/apparmor.d/usr.sbin/cupsd , here is my /usr/lib/cups/backend
/cups-pdf section:
/usr/lib/cups/backend/cups-pdf {
#include <abstractions/base>
#include <abstractions/fonts>
#include <abstractions/nameservice>
#include <abstractions/user-tmp>
capability chown,
capability fowner,
capability fsetid,
capability setgid,
capability setuid,
/bin/dash ixr,
/bin/bash ixr,
/etc/papersize r,
/etc/cups/cups-pdf.conf r,
@{HOME}/PDF/ rw,
@{HOME}/PDF/* rw,
/usr/bin/gs ixr,
/usr/lib/cups/backend/cups-pdf mr,
# /usr/lib/ghostscript/** mr,
/usr/share/** r,
/var/log/cups/cups-pdf_log w,
/var/spool/cups-pdf/** rw,
/var/tmp/ rw,
/var/tmp/** rw,
/var/spool/cups/ rw,
/var/spool/cups/** rw,
}
NOTE: commented out reference to non-existent /usr/lib/ghostscript, and
added /var/tmp and /var/spool/cups.
ALSO - output directory has to have perms at 700.. ie. chmod 700 ~/PDF
--
cups-pdf fails to generate file when user does not print to default ~/PDF
(apparmor vs.cups-pdf inconsistency)
https://bugs.launchpad.net/bugs/147551
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