This file is indexed.

postinst is in linux-image-extra-3.2.0-126-virtual 3.2.0-126.169.

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

case "$1" in
  configure)
    depmod -a -F /boot/System.map-3.2.0-126-virtual 3.2.0-126-virtual
    update-initramfs -u -k 3.2.0-126-virtual
    ;;
esac