This file is indexed.

postinst is in mlocate 0.26-2ubuntu3.1.

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

GROUP="mlocate"

if [ "$1" = "configure" ]; then
    update-alternatives --install /usr/bin/locate locate /usr/bin/mlocate 80 \
	--slave /usr/share/man/man1/locate.1.gz locate.1.gz /usr/share/man/man1/mlocate.1.gz \
	--slave /usr/bin/updatedb updatedb /usr/bin/updatedb.mlocate \
	--slave /usr/share/man/man8/updatedb.8.gz updatedb.8.gz /usr/share/man/man8/updatedb.mlocate.8.gz

    if ! sg "$GROUP" true 2>/dev/null; then
    	addgroup --system "$GROUP"
    fi

    if ! dpkg-statoverride --list /usr/bin/mlocate >/dev/null 2>&1; then
    	dpkg-statoverride --update --add root "$GROUP" 2755 /usr/bin/mlocate 
    fi
fi

# Obsolete file, this can be dropped post-jessie.
rm -f /var/lib/mlocate/daily.lock