Hrmm alright lets test and see if the printer works without apparmor
confinement involved at all

  sudo apparmor_parser -R /etc/init.d/usr.sbin.cupsd
  sudo restart cups
  ps -Z `pidof cupsd`

ensure that ps -Z reports a label of unconfined like
LABEL                             PID TTY      STAT   TIME COMMAND
unconfined                          1246 ?        Ss     0:00 /usr/sbin/cupsd -F

and now test the printer

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https://bugs.launchpad.net/bugs/1187970

Title:
  apparmor prevents custom printer driver from executing

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