/usr/ is in libroot-math-smatrix-dev 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/include/
/usr/include/root/
/usr/include/root/Math/
/usr/include/root/Math/UnaryOperators.h
/usr/include/root/Math/SVector.h
/usr/include/root/Math/Dsinv.h
/usr/include/root/Math/BinaryOpPolicy.h
/usr/include/root/Math/Dsfact.h
/usr/include/root/Math/CramerInversionSym.icc
/usr/include/root/Math/Dfact.h
/usr/include/root/Math/MatrixFunctions.h
/usr/include/root/Math/HelperOps.h
/usr/include/root/Math/SMatrix.h
/usr/include/root/Math/Dinv.h
/usr/include/root/Math/Dfactir.h
/usr/include/root/Math/StaticCheck.h
/usr/include/root/Math/BinaryOperators.h
/usr/include/root/Math/Functions.h
/usr/include/root/Math/SMatrix.icc
/usr/include/root/Math/SMatrixFfwd.h
/usr/include/root/Math/Dfinv.h
/usr/include/root/Math/SVector.icc
/usr/include/root/Math/MConfig.h
/usr/include/root/Math/CramerInversion.icc
/usr/include/root/Math/MatrixInversion.icc
/usr/include/root/Math/MatrixRepresentationsStatic.h
/usr/include/root/Math/SMatrixDfwd.h
/usr/include/root/Math/CholeskyDecomp.h
/usr/include/root/Math/Expression.h
/usr/share/
/usr/share/doc/
/usr/share/doc/libroot-math-smatrix-dev/
/usr/share/doc/libroot-math-smatrix-dev/copyright
/usr/lib/x86_64-linux-gnu/libSmatrix.so
/usr/share/doc/libroot-math-smatrix-dev/changelog.Debian.gz