This file is indexed.

prerm is in gnome-icon-theme-full 3.4.0-0ubuntu1.

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

if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ] ; then
  for name in debian-swirl gnome-foot ubuntu-logo; do
    update-alternatives --remove start-here.svg /usr/share/icons/gnome/scalable/places/$name.svg
  done
  rm -f /usr/share/icons/gnome/icon-theme.cache
fi