/usr/share/octave/packages/stk-2.5.0/lm/ is in octave-stk 2.5.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_affine/
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_affine/feval.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_affine/isequal.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_affine/stk_lm_affine.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_constant/
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_constant/feval.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_constant/isequal.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_constant/stk_lm_constant.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_cubic/
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_cubic/feval.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_cubic/isequal.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_cubic/stk_lm_cubic.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_matrix/
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_matrix/feval.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_matrix/isequal.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_matrix/stk_lm_matrix.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_null/
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_null/feval.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_null/isequal.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_null/stk_lm_null.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_quadratic/
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_quadratic/feval.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_quadratic/isequal.m
/usr/share/octave/packages/stk-2.5.0/lm/@stk_lm_quadratic/stk_lm_quadratic.m
/usr/share/octave/packages/stk-2.5.0/lm/doc-cache
/usr/share/octave/packages/stk-2.5.0/lm/stk_lm_polynomial.m