/usr/share/doc/erubis/changelog.Debian.gz is in erubis 2.7.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/erubis/../ruby-erubis/changelog.Debian.gz
/usr/share/doc/erubis/../ruby-erubis/changelog.Debian.gz