postinst is in libuim-dev 1:1.8.6+gh20180114.64e3173-2build2.
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 20 21 22 23 24 25 26 27 28 29 30 31 | #!/bin/sh
set -e
case "$1" in
    configure)
	dpkg-maintscript-helper dir_to_symlink \
		/usr/share/doc/libuim-dev /usr/share/doc/libuim8 1:1.8.6+gh20161003.0.d63dadd-2.1 -- "$@"
	if [ ! -e /usr/share/doc/libuim-dev ]; then
	    rm /usr/share/doc/libuim-dev
	    ln -s libuim8 /usr/share/doc/libuim-dev
	fi
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
 |