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/usr/share/doc/libsoprano-ruby1.8/changelog.Debian.gz is in libsoprano-ruby1.8 4:4.8.2-0ubuntu1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/share/doc/libsoprano-ruby1.8/../ruby-soprano/changelog.Debian.gz