/usr/share/doc/libgtkhtml-4.0-dbg/README is in libgtkhtml-4.0-dbg 4.2.2-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgtkhtml-4.0-dbg/../libgtkhtml-4.0-0/README
/usr/share/doc/libgtkhtml-4.0-dbg/../libgtkhtml-4.0-0/README