/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/ is in octave-sundials 2.5.0-3+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsAdvDiff_bnd.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsDiscRHS_dns.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsDiscSOL_dns.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsDiurnal_kry.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsHessian_FSA_ASA.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsOzone_FSA_dns.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsPleiades_non.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsPollut_FSA_dns.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsRoberts_ASAi_dns.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsRoberts_FSA_dns.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsRoberts_dns.m
/usr/share/octave/site/m/sundialsTB/cvodes/examples_ser/mcvsVanDPol_dns.m