/usr/share/doc/libdxflib-2.5.0.0-dbg/changelog.Debian.gz is in libdxflib-2.5.0.0-dbg 2.5.0.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdxflib-2.5.0.0-dbg/../libdxflib-2.5.0.0/changelog.Debian.gz