/usr/share/doc/libfarstream-0.1-dbg/changelog.Debian.gz is in libfarstream-0.1-dbg 0.1.2-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libfarstream-0.1-dbg/../libfarstream-0.1-0/changelog.Debian.gz