/usr/share/doc/libspatialite5-dbg/changelog.Debian.gz is in libspatialite5-dbg 4.1.1-5ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libspatialite5-dbg/../libspatialite5/changelog.Debian.gz