preinst is in uim-gtk2.0 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 | #! /bin/sh
# preinst script for uim
#
# see: dh_installdeb(1)
set -e
case "$1" in
    upgrade)
	if dpkg --compare-versions "$2" le-nl "1:1.8.6+gh20161003.0.d63dadd-5~"; then
		update-alternatives --remove uim-toolbar \
			/usr/bin/uim-toolbar-gtk-systray
	fi
    ;;
    install|abort-upgrade)
    ;;
    *)
        echo "preinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
exit 0
 |