Martin-Éric Racine, the postinst script already tries to start CUPS at first, so the system of the original poster seems to be rather broken (misconfigured cupsd.conf or AppArmor bug in the cupsys package).
Martin-Éric Racine, the postinst script already tries to start CUPS at first, so the system of the original poster seems to be rather broken (misconfigured cupsd.conf or AppArmor bug in the cupsys package).