to stop apparmor type this into the terminal: sudo /etc/init.d/apparmor stop
to edit /etc/apparmor.d/usr.sbin.cupsd type this: sudo gedit /etc/apparmor.d/usr.sbin.cupsd then do the proposed edit
to stop apparmor type this into the terminal: d/apparmor stop
sudo /etc/init.
to edit /etc/apparmor. d/usr.sbin. cupsd type this: d/usr.sbin. cupsd
sudo gedit /etc/apparmor.
then do the proposed edit