postinst is in nova-compute-kvm 2:14.0.0-4+deb9u1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
if dpkg-vendor --derives-from ubuntu ; then
adduser --quiet nova libvirtd
else
adduser --quiet nova libvirt
fi
fi
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