/usr/share/doc/linux-tools-3.13.0-48-lowlatency/changelog.Debian.gz is in linux-tools-3.13.0-48-lowlatency 3.13.0-48.80.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-tools-3.13.0-48-lowlatency/../linux-tools-3.13.0-48/changelog.Debian.gz