This file is indexed.

postinst is in epiphany-browser 3.18.5-0ubuntu1.

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

PRIO=85
for alt in x-www-browser gnome-www-browser; do
    update-alternatives --install \
        /usr/bin/$alt $alt /usr/bin/epiphany-browser $PRIO \
            --slave /usr/share/man/man1/$alt.1.gz $alt.1.gz /usr/share/man/man1/epiphany-browser.1.gz
done