/usr/share/octave/ is in octave-optiminterp 0.3.4-2+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/packages/
/usr/share/octave/packages/optiminterp-0.3.4/
/usr/share/octave/packages/optiminterp-0.3.4/doc-cache
/usr/share/octave/packages/optiminterp-0.3.4/example_optiminterp.m
/usr/share/octave/packages/optiminterp-0.3.4/optiminterp1.m
/usr/share/octave/packages/optiminterp-0.3.4/optiminterp2.m
/usr/share/octave/packages/optiminterp-0.3.4/optiminterp3.m
/usr/share/octave/packages/optiminterp-0.3.4/optiminterp4.m
/usr/share/octave/packages/optiminterp-0.3.4/optiminterpn.m
/usr/share/octave/packages/optiminterp-0.3.4/packinfo/
/usr/share/octave/packages/optiminterp-0.3.4/packinfo/DESCRIPTION
/usr/share/octave/packages/optiminterp-0.3.4/packinfo/INDEX
/usr/share/octave/packages/optiminterp-0.3.4/packinfo/NEWS
/usr/share/octave/packages/optiminterp-0.3.4/test_optiminterp.m
/usr/share/octave/packages/optiminterp-0.3.4/test_optiminterp_err.m
/usr/share/octave/packages/optiminterp-0.3.4/test_optiminterp_mult.m