prerm is in gedit 3.4.1-0ubuntu1.
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.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #! /bin/sh
set -e
case "$1" in
    remove|upgrade|deconfigure)
        # unregister gedit as a gnome-text-editor in the alternatives system
        update-alternatives --remove gnome-text-editor /usr/bin/gedit || true
    ;;
    failed-upgrade)
    ;;
    *)
        echo "prerm called with unknown argument \`$1'" >&2
        exit 0
    ;;
esac
# Automatically added by dh_python2:
if which pyclean >/dev/null 2>&1; then
	pyclean -p gedit 
else
	dpkg -L gedit | grep \.py$ | while read file
	do
		rm -f "${file}"[co] >/dev/null
  	done
fi
# End automatically added section
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