/usr/share/doc/liblttng-ctl-dev/changelog.Debian.gz is in liblttng-ctl-dev 2.0.1-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liblttng-ctl-dev/../liblttng-ctl0/changelog.Debian.gz