/usr/include/linbox/matrix/matrixdomain/ is in liblinbox-dev 1.4.2-5build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/linbox/matrix/matrixdomain/apply-domain.h
/usr/include/linbox/matrix/matrixdomain/blas-matrix-domain.h
/usr/include/linbox/matrix/matrixdomain/blas-matrix-domain.inl
/usr/include/linbox/matrix/matrixdomain/matrix-domain-gf2.h
/usr/include/linbox/matrix/matrixdomain/matrix-domain.h
/usr/include/linbox/matrix/matrixdomain/matrix-domain.inl
/usr/include/linbox/matrix/matrixdomain/opencl-domain-factory.h
/usr/include/linbox/matrix/matrixdomain/opencl-domain-memory.inl
/usr/include/linbox/matrix/matrixdomain/opencl-domain-util.inl
/usr/include/linbox/matrix/matrixdomain/opencl-domain.h
/usr/include/linbox/matrix/matrixdomain/opencl-domain.inl
/usr/include/linbox/matrix/matrixdomain/plain-domain.h