Comment 2 for bug 1565617

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Martin Pitt (pitti) wrote : Re: Ubuntu 16.04 : Error messages are seen while installing apport package

This happens because "policykit-1" is being installed at the same time, but it is only unpacked, not yet configured while other packages are being configured which calls systemctl. This is only cosmetical and does not actually break the packages, so lowering importance.

I think policykit-1 itself is fine, we do want to mask services of packages which are unpackaged but not yet configured.
So this is indeed somewhere between init-system-helpers or systemctl itself, either of which could suppress that error message.