Either of those should have worked for that denial message. Perhaps the
compiled policy cache is not being updated correctly

with either of the above changes to the /etc/apparmor.d/usr.sbin.cupsd
file and with out rebooting can you try

  sudo apparmor_parser -vTWr /etc/apparmor.d/usr.sbin.cupsd

and then try printing. You may have to do
  sudo restart cups

but I don't believe that should be necessary.

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

Title:
  apparmor prevents custom printer driver from executing

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