This file is indexed.

postinst is in mutter 3.18.3-0ubuntu2.

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

action="$1"

if [ "$action" = configure ]; then
    # register the alternatives of x-window-manager manually
    # because dh_installwm doesn't register manpage as slave yet.
    update-alternatives --install /usr/bin/x-window-manager \
        x-window-manager /usr/bin/mutter 60 \
        --slave /usr/share/man/man1/x-window-manager.1.gz \
        x-window-manager.1.gz /usr/share/man/man1/mutter.1.gz
fi