/usr/share/doc/uno-libs3/README.Debian.gz is in uno-libs3 3.5.7-0ubuntu13.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/uno-libs3/../ure/README.Debian.gz
/usr/share/doc/uno-libs3/../ure/README.Debian.gz