/usr/share/cups/fonts/FreeMono.ttf is in cups-filters 1.0.52-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/cups/fonts/../../fonts/truetype/freefont/FreeMono.ttf
/usr/share/cups/fonts/../../fonts/truetype/freefont/FreeMono.ttf