/usr/share/doc/libamrita2-ruby1.9.1/changelog.Debian.gz is in libamrita2-ruby1.9.1 2.0.2+dfsg.1-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libamrita2-ruby1.9.1/../ruby-amrita2/changelog.Debian.gz