/usr/share/debhelper/autoscripts/postinst-xfonts is in debhelper 9.20120115ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | if which update-fonts-dir >/dev/null 2>&1; then
#CMDS#
fi
|