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/usr/share/seccomp/policygroups/ubuntu-core/16.04/container-management is in ubuntu-core-security-seccomp 16.04.15.1.

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# Description: Can manage containers. This is restricted because it gives wide
# access to the system, which is needed for software managing containers.
# Usage: reserved

# Must use unrestricted because container managers like docker and LXD use
# seccomp themselves for container isolation. Since seccomp can only get more
# strict and containers may want to have more access than is in the default
# policy, use unrestricted seccomp policy.
@unrestricted