/usr/share/doc/octave-interval/NEWS is in octave-interval 3.1.0-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/octave-interval/../../octave/packages/interval-3.1.0/packinfo/NEWS
/usr/share/doc/octave-interval/../../octave/packages/interval-3.1.0/packinfo/NEWS