This file is indexed.

preinst is in aptitude 0.6.6-1ubuntu1.

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" = "upgrade" ] && dpkg --compare-versions "$2" lt "0.2.8.1-1";
then
  mv /var/state/aptitude /var/lib
fi