/usr/share/doc/libu1db-qt5-dev/changelog.Debian.gz is in libu1db-qt5-dev 0.1.5+15.10.20150826.1-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libu1db-qt5-dev/../libu1db-qt5-3/changelog.Debian.gz