/usr/share/doc/libreoffice-help-zh-tw/README.gz is in libreoffice-help-zh-tw 1:5.1.2-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libreoffice-help-zh-tw/../libreoffice-l10n-zh-tw/README.gz