/usr/share/octave/4.2.2/m/linear-algebra/ 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/linear-algebra/bandwidth.m
/usr/share/octave/4.2.2/m/linear-algebra/commutation_matrix.m
/usr/share/octave/4.2.2/m/linear-algebra/cond.m
/usr/share/octave/4.2.2/m/linear-algebra/condeig.m
/usr/share/octave/4.2.2/m/linear-algebra/condest.m
/usr/share/octave/4.2.2/m/linear-algebra/cross.m
/usr/share/octave/4.2.2/m/linear-algebra/duplication_matrix.m
/usr/share/octave/4.2.2/m/linear-algebra/expm.m
/usr/share/octave/4.2.2/m/linear-algebra/housh.m
/usr/share/octave/4.2.2/m/linear-algebra/isbanded.m
/usr/share/octave/4.2.2/m/linear-algebra/isdefinite.m
/usr/share/octave/4.2.2/m/linear-algebra/isdiag.m
/usr/share/octave/4.2.2/m/linear-algebra/ishermitian.m
/usr/share/octave/4.2.2/m/linear-algebra/issymmetric.m
/usr/share/octave/4.2.2/m/linear-algebra/istril.m
/usr/share/octave/4.2.2/m/linear-algebra/istriu.m
/usr/share/octave/4.2.2/m/linear-algebra/krylov.m
/usr/share/octave/4.2.2/m/linear-algebra/linsolve.m
/usr/share/octave/4.2.2/m/linear-algebra/logm.m
/usr/share/octave/4.2.2/m/linear-algebra/normest.m
/usr/share/octave/4.2.2/m/linear-algebra/normest1.m
/usr/share/octave/4.2.2/m/linear-algebra/null.m
/usr/share/octave/4.2.2/m/linear-algebra/orth.m
/usr/share/octave/4.2.2/m/linear-algebra/planerot.m
/usr/share/octave/4.2.2/m/linear-algebra/qzhess.m
/usr/share/octave/4.2.2/m/linear-algebra/rank.m
/usr/share/octave/4.2.2/m/linear-algebra/rref.m
/usr/share/octave/4.2.2/m/linear-algebra/subspace.m
/usr/share/octave/4.2.2/m/linear-algebra/trace.m
/usr/share/octave/4.2.2/m/linear-algebra/vech.m