/usr/share/doc/libgoa-backend-1.0-dev/changelog.Debian.gz is in libgoa-backend-1.0-dev 3.10.3-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgoa-backend-1.0-dev/../libgoa-1.0-0b/changelog.Debian.gz