Comment 56 for bug 872711

It means cupsd tried to do something but was blocked by apparmor. 'man capabilties' then read CAP_SYS_ADMIN. If you run cupsd in the foreground (-f) then you will probably see it log an error at the point it gets blocked, otherwise strace it. You can turn off apparmor with 'aa-complain /usr/sbin/cupsd' , which will still log errors but won't block anything.