/usr/share/doc/libgtkhtml-4.0-dev/NEWS.gz is in libgtkhtml-4.0-dev 4.6.6-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgtkhtml-4.0-dev/../libgtkhtml-4.0-0/NEWS.gz
/usr/share/doc/libgtkhtml-4.0-dev/../libgtkhtml-4.0-0/NEWS.gz