/usr/share/games/trackballs/fonts/FreeSerifBoldItalic.ttf is in trackballs-data 1.2.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/games/trackballs/fonts/../../../fonts/truetype/freefont/FreeSerifBoldItalic.ttf