/usr/share/doc/libguichan-sdl-0.8.1-1/changelog.Debian.gz is in libguichan-sdl-0.8.1-1 0.8.2-5ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libguichan-sdl-0.8.1-1/../libguichan-0.8.1-1/changelog.Debian.gz