This file is indexed.

preinst is in libcanberra-gtk3-module 0.30-0ubuntu3.

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

case "$1" in
  upgrade)
    if dpkg --compare-versions "$2" le "0.28-2"; then
      if [ -f '/etc/X11/Xsession.d/52libcanberra-gtk3-module_add-to-gtk-modules/52libcanberra-gtk-module_add-to-gtk-modules' ]; then
        rm -f '/etc/X11/Xsession.d/52libcanberra-gtk3-module_add-to-gtk-modules/52libcanberra-gtk-module_add-to-gtk-modules'
      fi
    fi
esac


exit 0