/usr/share/doc/libjpeg-turbo-test/changelog.Debian.gz is in libjpeg-turbo-test 1.3.0-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libjpeg-turbo-test/../libturbojpeg/changelog.Debian.gz