/usr/share/doc/libfarstream-0.2-dbg/changelog.Debian.gz is in libfarstream-0.2-dbg 0.2.3-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libfarstream-0.2-dbg/../libfarstream-0.2-2/changelog.Debian.gz