/etc/fonts/conf.d/ is in fontconfig-config 2.8.0-3ubuntu9.2.
This file is owned by root:root, with mode 0o755.
..
/etc/fonts/conf.d/10-antialias.conf
/etc/fonts/conf.d/10-hinting-slight.conf
/etc/fonts/conf.d/10-hinting.conf
/etc/fonts/conf.d/11-lcd-filter-lcddefault.conf
/etc/fonts/conf.d/20-fix-globaladvance.conf
/etc/fonts/conf.d/20-unhint-small-vera.conf
/etc/fonts/conf.d/30-metric-aliases.conf
/etc/fonts/conf.d/30-urw-aliases.conf
/etc/fonts/conf.d/40-nonlatin.conf
/etc/fonts/conf.d/45-latin.conf
/etc/fonts/conf.d/49-sansserif.conf
/etc/fonts/conf.d/50-user.conf
/etc/fonts/conf.d/51-local.conf
/etc/fonts/conf.d/53-monospace-lcd-filter.conf
/etc/fonts/conf.d/60-latin.conf
/etc/fonts/conf.d/65-fonts-persian.conf
/etc/fonts/conf.d/65-nonlatin.conf
/etc/fonts/conf.d/69-unifont.conf
/etc/fonts/conf.d/70-no-bitmaps.conf
/etc/fonts/conf.d/80-delicious.conf
/etc/fonts/conf.d/90-synthetic.conf
/etc/fonts/conf.d/README