/etc/fonts/conf.d/90-arphic-ukai-embolden.conf is in fonts-arphic-ukai 0.2.20080216.2-4ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/fonts/conf.d/../conf.avail/90-arphic-ukai-embolden.conf