postinst is in gnome-illustrious-icon-theme 5.5.1-2ubuntu2.
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 6 7 | #!/bin/sh
set -e
# Automatically added by dh_icons
if which update-icon-caches >/dev/null 2>&1 ; then
update-icon-caches /usr/share/icons/gnome-illustrious
fi
# End automatically added section
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