postinst is in ubuntu-desktop-mir 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.
1 2 3 4 5 | #!/bin/sh
set -e
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/lightdm/lightdm.conf.d/10-unity-system-compositor.conf 0.0.2+14.04.20131128.2-0ubuntu1 -- "$@"
# End automatically added section
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