preinst is in fonts-arphic-ukai 0.2.20080216.2-4ubuntu2.
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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | #!/bin/sh
set -e
VERSION=0.2.20080216.1-2
PKG=ttf-arphic-ukai
FILE=/etc/defoma/hints/${PKG}.hints
# Remove a no-longer used conffile
rm_conffile() {
    local PKGNAME="$1"
    local CONFFILE="$2"
    [ -e "$CONFFILE" ] || return 0
    local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
    local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PKGNAME | \
            sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; s/newconffile//;p }")"
    if [ "$md5sum" != "$old_md5sum" ]; then
        echo "Obsolete conffile $CONFFILE has been modified by you."
        echo "Saving as $CONFFILE.dpkg-bak ..."
        mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
    else
        echo "Removing obsolete conffile $CONFFILE ..."
        rm -f "$CONFFILE"
    fi
}
case "$1" in
install|upgrade)
    if dpkg --compare-versions "$2" lt-nl "$VERSION"; then
	if [ -f $FILE ]; then
        	if [ -x /usr/bin/defoma-font ]; then
			defoma-font purge-all $FILE || true
		fi
	fi
	rm_conffile $PKG $FILE
    fi
    # cleaning up old cruft
    VERSION=0.2.20080216.1-1
    PKG=ttf-arphic-ukai
    FILE=/etc/defoma/hints/${PKG}-mbe.hints
    if dpkg --compare-versions "$2" lt-nl "$VERSION"; then
	if [ -f $FILE ]; then
        	if [ -x /usr/bin/defoma-font ]; then
			defoma-font purge-all $FILE || true
		fi
	fi
	rm_conffile $PKG $FILE
	OLDTTF=ukai.ttf
	OLDMBETTF=ukaimbe.ttf
	for X in [ /etc/fonts/conf.d/70-${PACKAGE}.conf \
		   /etc/fonts/conf.d/${PACKAGE} \
		   /usr/share/fonts/truetype/${OLDTTF} \
		   /usr/share/fonts/truetype/${OLDMBETTF} \
		   /var/lib/defoma/x-ttcidconf.d/dirs/TrueType/${OLDTTF} \
		   /var/lib/defoma/x-ttcidconf.d/dirs/TrueType/${OLDMBETTF} \
		]; do
  		if [ -e ${X} ]; then
    			rm -f ${X};
  		fi;
	done
	if [ -d /usr/share/${PACKAGE} ]; then
		rm -rf /usr/share/${PACKAGE};
	fi
    fi
esac
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/fonts/conf.avail/gbp.conf 0.2.20080216.2-4ubuntu2~ fonts-arphic-ukai -- "$@"
# End automatically added section
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