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Keep an eye on this bug report...

https://bugs.launchpad.net/ubuntu/+source/zlib/+bug/439407

...and restarted AppArmor:

root@rossg-workstation:~# service apparmor restart
* Reloading AppArmor profiles ... [OK]

I had the same error. It seems I was missing '/var/run/samba' from the AppArmor profile for cupsd. I added the last two lines from the following:

root@rossg-workstation:~# grep samba...

Ah, while Googling to find where to report this as a problem, I also came across this, which may help explain things...

http://www.debuntu.org/intrusion-detection-with-aide

This helped...

http://ubuntuforums.org/archive/index.php/t-1096333.html

This error message, on the other hand, did not (one more time, for the search engines)...

"Couldn't open file...

No, I've just run into the same thing.

grepped the config file (/etc/aide.conf) and dirs (/etc/aide.conf.d/*) for the word 'please-dont-call-aide-without-parameters', but couldn't find it.

Read...