/usr/share/octave/4.2.2/m/optimization/ is in octave-common 4.2.2-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/4.2.2/m/optimization/PKG_ADD
/usr/share/octave/4.2.2/m/optimization/__all_opts__.m
/usr/share/octave/4.2.2/m/optimization/fminbnd.m
/usr/share/octave/4.2.2/m/optimization/fminsearch.m
/usr/share/octave/4.2.2/m/optimization/fminunc.m
/usr/share/octave/4.2.2/m/optimization/fsolve.m
/usr/share/octave/4.2.2/m/optimization/fzero.m
/usr/share/octave/4.2.2/m/optimization/glpk.m
/usr/share/octave/4.2.2/m/optimization/lsqnonneg.m
/usr/share/octave/4.2.2/m/optimization/optimget.m
/usr/share/octave/4.2.2/m/optimization/optimset.m
/usr/share/octave/4.2.2/m/optimization/pqpnonneg.m
/usr/share/octave/4.2.2/m/optimization/private/
/usr/share/octave/4.2.2/m/optimization/private/__fdjac__.m
/usr/share/octave/4.2.2/m/optimization/qp.m
/usr/share/octave/4.2.2/m/optimization/sqp.m