an interresting link : http://www.ubuntu.com/getubuntu/releasenotes/710
Printing with AppArmor

Ubuntu 7.10 introduces an additional security layer called AppArmor,
whose support for CUPS printing is not yet complete. This will result in
printing failures in certain corner cases described below. The
workaround in each of these cases is to disable the AppArmor CUPS
profile by running sudo aa-complain cupsd. AppArmor support may be re-
enabled by running sudo aa-enforce cupsd.

    *  Printing to bluetooth printers does not work with AppArmor enabled. Bug 
#147800 : https://launchpad.net/bugs/147800
    *  Many third-party printer drivers (especially from printer manufacturers) 
do not work. Bug #152537 : https://launchpad.net/bugs/152537

seems to be duplicate with theses bugs ...

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inode_permission error for cupsd on /dev/tty
https://bugs.launchpad.net/bugs/153003
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