/usr/share/doc/libebook-1.2-16/TODO is in libebook-1.2-16 3.18.5-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libebook-1.2-16/../libcamel-1.2-54/TODO
/usr/share/doc/libebook-1.2-16/../libcamel-1.2-54/TODO