postinst is in sensible-utils 0.0.9ubuntu0.14.04.1.
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 8 9 10 11 12 13 14 15 16 17 18 19 | #! /bin/sh
set -e
case "$1" in
(configure)
if which update-mime >/dev/null;
then
update-mime
fi
;;
(abort-upgrade|abort-remove|abort-deconfigure)
;;
(*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
|