This file is indexed.

postinst is in sddm-theme-debian-elarun 0.14.0-4+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.

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#!/bin/bash
set -e

if [[ "$1" = "configure" || "$1" = "abort-upgrade" || "$1" = "abort-remove" ]]; then
    update-alternatives --install \
        /usr/share/sddm/themes/debian-theme \
        sddm-debian-theme \
        /usr/share/sddm/themes/debian-elarun 50
fi

# Tag to allow some debhelper commands to inject relevant code