/usr/share/cegui-0.8.4/fonts/DejaVuSerif.ttf is in libcegui-mk2-doc 0.8.4+dfsg-4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/cegui-0.8.4/fonts/../../fonts/truetype/dejavu/DejaVuSerif.ttf