/usr/include/linbox/util/ is in liblinbox-dev 1.4.2-5build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/linbox/util/args-parser.h
/usr/include/linbox/util/commentator.h
/usr/include/linbox/util/commentator.inl
/usr/include/linbox/util/contracts.h
/usr/include/linbox/util/debug.h
/usr/include/linbox/util/error.h
/usr/include/linbox/util/field-axpy.h
/usr/include/linbox/util/formats/
/usr/include/linbox/util/formats/generic-dense.h
/usr/include/linbox/util/formats/maple.h
/usr/include/linbox/util/formats/matrix-market.h
/usr/include/linbox/util/formats/matrix-stream-readers.h
/usr/include/linbox/util/formats/sms.h
/usr/include/linbox/util/formats/sparse-row.h
/usr/include/linbox/util/iml_wrapper.h
/usr/include/linbox/util/matrix-stream.h
/usr/include/linbox/util/matrix-stream.inl
/usr/include/linbox/util/mpicpp.h
/usr/include/linbox/util/mpicpp.inl
/usr/include/linbox/util/prime-stream.h
/usr/include/linbox/util/timer.h
/usr/include/linbox/util/write-mm.h