postrm is in fontconfig-config 2.11.0-0ubuntu4.2.
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.
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  | #! /bin/sh
set -e
CONF=/etc/fonts/local.conf
case "$1" in
	purge)
	    if [ -x /usr/bin/ucf ]; then
		ucf --purge $CONF
	    fi
	    rm -f $CONF
	    rm -rf /etc/fonts/conf.d
	    rmdir /usr/local/share/fonts 2>/dev/null || true
	    ;;
esac
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/fonts/fonts.dtd 2.10.1-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/fonts/conf.avail/20-fix-globaladvance.conf 2.10.1-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/fonts/conf.avail/11-lcd-filter-lcddefault.conf 2.10.1-0ubuntu1 -- "$@"
# End automatically added section
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