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Our modifications to the AppArmor profile for cupsd need updating for Stretch

Backends

apparmor="DENIED" operation="exec" profile="/usr/sbin/cupsd" name="/usr/lib/cups/backend/beh" pid=5446 comm="cups-deviced" requested_mask="x" denied_mask="x"

See #9963 (closed) for the original reason for the patching. First try to drop these bits of our patch and see if it works better with no modification on Stretch. Worst case just update the list of backends.

Other issues

apparmor="DENIED" operation="mkdir" profile="/usr/sbin/cupsd" name="/lib/live/mount/overlay/var/.wh..wh.spool.0096/" pid=5685 comm="cupsd" requested_mask="c" denied_mask="c"

Related issues

Original created by @intrigeri on 11699 (Redmine)

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