/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/ is in octave-linear-algebra 2.2.0-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/blksize.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/blksparse.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/ctranspose.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/display.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/full.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/ismatrix.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/isreal.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/issparse.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/minus.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/mldivide.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/mrdivide.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/mtimes.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/plus.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/size.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/sparse.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/subsref.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/transpose.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/uminus.m
/usr/share/octave/packages/linear-algebra-2.2.0/@blksparse/uplus.m