Have you tried disabling apparmor by booting with apparmor=0 or so?
- Bug#1129212: [systemd] printing broken Lyndon Brown
- Bug#1129212: [systemd] printing broken Lyndon Brown
- Bug#1129212: [systemd] printing broken Luca Boccassi
- Bug#1129212: [systemd] printing broken Francesco Poli
- Bug#1129212: [systemd] printing broken Niko Sandschneider
- Bug#1129212: [systemd] printing broken Luca Boccassi
- Bug#1129212: cups-daemon: apparmor policy needs to... Oliver Grimm
