/etc/fonts/conf.d/30-cjk-aliases.conf is in language-selector-common 0.188.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/fonts/conf.d/../conf.avail/30-cjk-aliases.conf
/etc/fonts/conf.d/../conf.avail/30-cjk-aliases.conf