/usr/share/doc/libgtk-vnc-2.0-0/changelog.Debian.gz is in libgtk-vnc-2.0-0 0.5.0-1ubuntu1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgtk-vnc-2.0-0/../libgvnc-1.0-0/changelog.Debian.gz