The version you requested (9.3.22-0ubuntu0.14.04) is not available, but a newer one is (9.3.24-0ubuntu0.14.04). We redirected you there.
This file is indexed.

postinst is in postgresql-9.3 9.3.24-0ubuntu0.14.04.

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.

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#!/bin/sh

set -e

VERSION=9.3


if [ "$1" = configure ]; then
    . /usr/share/postgresql-common/maintscripts-functions

    configure_version $VERSION "$2"
fi