/usr/share/doc/libxfcegui4-4-dbg/changelog.Debian.gz is in libxfcegui4-4-dbg 4.10.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libxfcegui4-4-dbg/../libxfcegui4-4/changelog.Debian.gz