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Here is a patch to fix a service warning on Ubuntu 16.04+. There might be other things that need fixing too, but this fixes a visible issue in the default install.
Postfix decided to disallow shlib_directory = daemon_directory in 3.0+. Ubuntu added an 'sbin' subdir to house the daemon_directory going forward. I added this new location to daemon_directory in params.pp.
A better way might be to set the old default for all existing old Ubuntu versions & change the 'default' case to the new default. But this way works best for my existing environment.
I also attach a patch, in case people want to patch current release to work on
thias-postfix_patch.txt
xenial.