This file is indexed.

postinst is in unity-system-compositor 0.4.3+16.04.20160323-0ubuntu1.

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.

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# Prompt the user to reboot so they get the new u-s-c that has been installed
[ -x /usr/share/update-notifier/notify-reboot-required ] && \
  /usr/share/update-notifier/notify-reboot-required || true

# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/lightdm/lightdm.conf.d/10-unity-system-compositor.conf 0.0.1+14.04.20131028.1-0ubuntu1 unity-system-compositor -- "$@"
# End automatically added section