postinst is in libcupt4-1 2.9.4ubuntu1.
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 | #!/bin/sh
set -e
if [ ! -e /var/lib/cupt ]; then
mkdir /var/lib/cupt
fi
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