This file is indexed.

postrm is in desktop-file-utils 0.20-0ubuntu2.

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 [ "$1" = remove ]; then
    for dir in /usr/share/applications /usr/local/share/applications; do
      if [ -d "$dir" ]; then
          rm -f "$dir/mimeinfo.cache"
          if [ ! -L "$dir" ]; then
              rmdir --ignore-fail-on-non-empty "$dir"
          fi
      fi
    done
fi