/usr/share/doc/libguichan-dev/changelog.Debian.gz is in libguichan-dev 0.8.2-15.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libguichan-dev/../libguichan-0.8.1-1v5/changelog.Debian.gz
/usr/share/doc/libguichan-dev/../libguichan-0.8.1-1v5/changelog.Debian.gz