/etc/fonts/conf.d/65-0-fonts-gubbi.conf is in fonts-gubbi 1.3-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/fonts/conf.d/../conf.avail/65-0-fonts-gubbi.conf
/etc/fonts/conf.d/../conf.avail/65-0-fonts-gubbi.conf