This file is indexed.

prerm is in gnome-session-flashback 1:3.28.0-1ubuntu1.

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

if [ "$1" = "remove" ]; then
  update-alternatives --remove \
    x-session-manager /usr/lib/gnome-flashback/gnome-flashback-metacity
fi

# Automatically added by dh_installsystemd/11.1.5ubuntu1
if [ -d /run/systemd/system ] && [ "$1" = remove ]; then
	deb-systemd-invoke stop 'gnome-session-flashback.target' >/dev/null || true
fi
# End automatically added section