postinst is in lfc-server-postgres 1.10.0-2.
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.
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set -e
updatelfc () {
    [ -r /etc/default/lfcdaemon ] && . /etc/default/lfcdaemon
    [ -z "$NSCONFIGFILE" ] && NSCONFIGFILE=/etc/NSCONFIG
    [ -r $NSCONFIGFILE ] || return 0
    nscfg=$(cat $NSCONFIGFILE)
    cfg1=$(echo $nscfg | cut -f1 -d@)
    cfg2=$(echo $nscfg | cut -f2 -d@ -s)
    user=$(echo $cfg1 | cut -f1 -d/)
    passwd=$(echo $cfg1 | cut -f2 -d/ -s)
    host=$(echo $cfg2 | cut -f1 -d/)
    db=$(echo $cfg2 | cut -f2 -d/ -s)
    [ -z "$user" ] && return 0
    [ -z "$passwd" ] && return 0
    [ -z "$host" ] && return 0
    [ -z "$db" ] && db=cns_db
    export PGPASSWORD=$passwd
    psql="psql -t -q -U $user $db"
    vmajor=$($psql -c "select major from schema_version" 2>/dev/null)
    vminor=$($psql -c "select minor from schema_version" 2>/dev/null)
    vpatch=$($psql -c "select patch from schema_version" 2>/dev/null)
    if [ -z "$vmajor" -o -z "$vminor" -o -z "$vpatch" ] ; then
	return 0
    fi
    if [ $vmajor -eq 3 -a $vminor -eq 0 -a $vpatch -eq 0 ] ; then
	$psql <<-EOF
	ALTER TABLE Cns_groupinfo ADD banned INTEGER;
	ALTER TABLE Cns_userinfo ADD user_ca VARCHAR(255);
	ALTER TABLE Cns_userinfo ADD banned INTEGER;
	CREATE INDEX linkname_idx ON Cns_symlinks(linkname);
	UPDATE schema_version SET major = 3, minor = 1, patch = 0;
	EOF
    fi
    return 0
}
getent group lfcmgr > /dev/null || \
    addgroup --quiet --system lfcmgr
getent passwd lfcmgr > /dev/null || \
    adduser --quiet --system --home /var/lib/lfc --shell /bin/sh \
    --ingroup lfcmgr --disabled-password --disabled-login \
    --gecos "LFC manager" lfcmgr
chown lfcmgr:lfcmgr /var/lib/lfc
chown lfcmgr:lfcmgr /var/log/lfc
updatelfc
update-alternatives --install /usr/sbin/lfcdaemon lfcdaemon \
          /usr/lib/lfc-postgres/lfcdaemon 10 \
  --slave /usr/share/man/man8/lfcdaemon.8.gz lfcdaemon.8.gz \
          /usr/lib/lfc-postgres/lfcdaemon.8.gz \
  --slave /usr/share/lcgdm/NSCONFIG.templ NSCONFIG.templ \
          /usr/lib/lfc-postgres/NSCONFIG.templ \
  --slave /etc/init.d/lfcdaemon lfcdaemon.init \
          /etc/lfc-postgres/lfcdaemon.init \
  --slave /etc/default/lfcdaemon lfcdaemon.conf \
          /etc/lfc-postgres/lfcdaemon.conf \
  --slave /etc/logrotate.d/lfcdaemon lfcdaemon.logrotate \
          /etc/lfc-postgres/lfcdaemon.logrotate \
  --slave /usr/sbin/lfc-shutdown lfc-shutdown \
          /usr/lib/lfc-postgres/lfc-shutdown \
  --slave /usr/share/man/man8/lfc-shutdown.8.gz lfc-shutdown.8.gz \
          /usr/lib/lfc-postgres/lfc-shutdown.8.gz
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -x "/etc/init.d/lfcdaemon" ]; then
		update-rc.d lfcdaemon defaults-disabled >/dev/null
		invoke-rc.d lfcdaemon start || exit 1
	fi
fi
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