/etc/fonts/conf.d/69-unifont.conf is in fontconfig-config 2.11.0-0ubuntu4.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/fonts/conf.d/../conf.avail/69-unifont.conf
/etc/fonts/conf.d/../conf.avail/69-unifont.conf