/usr/ is in libignition-math2-dev 2.9.0+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/ignition/
/usr/include/ignition/math2/
/usr/include/ignition/math2/ignition/
/usr/include/ignition/math2/ignition/math/
/usr/include/ignition/math2/ignition/math/AffineException.hh
/usr/include/ignition/math2/ignition/math/Angle.hh
/usr/include/ignition/math2/ignition/math/Box.hh
/usr/include/ignition/math2/ignition/math/Color.hh
/usr/include/ignition/math2/ignition/math/Filter.hh
/usr/include/ignition/math2/ignition/math/Frustum.hh
/usr/include/ignition/math2/ignition/math/Helpers.hh
/usr/include/ignition/math2/ignition/math/IndexException.hh
/usr/include/ignition/math2/ignition/math/Inertial.hh
/usr/include/ignition/math2/ignition/math/Kmeans.hh
/usr/include/ignition/math2/ignition/math/Line2.hh
/usr/include/ignition/math2/ignition/math/Line3.hh
/usr/include/ignition/math2/ignition/math/MassMatrix3.hh
/usr/include/ignition/math2/ignition/math/Matrix3.hh
/usr/include/ignition/math2/ignition/math/Matrix4.hh
/usr/include/ignition/math2/ignition/math/OrientedBox.hh
/usr/include/ignition/math2/ignition/math/PID.hh
/usr/include/ignition/math2/ignition/math/Plane.hh
/usr/include/ignition/math2/ignition/math/Pose3.hh
/usr/include/ignition/math2/ignition/math/Quaternion.hh
/usr/include/ignition/math2/ignition/math/Rand.hh
/usr/include/ignition/math2/ignition/math/RotationSpline.hh
/usr/include/ignition/math2/ignition/math/SemanticVersion.hh
/usr/include/ignition/math2/ignition/math/SignalStats.hh
/usr/include/ignition/math2/ignition/math/SphericalCoordinates.hh
/usr/include/ignition/math2/ignition/math/Spline.hh
/usr/include/ignition/math2/ignition/math/Temperature.hh
/usr/include/ignition/math2/ignition/math/Triangle.hh
/usr/include/ignition/math2/ignition/math/Triangle3.hh
/usr/include/ignition/math2/ignition/math/Vector2.hh
/usr/include/ignition/math2/ignition/math/Vector3.hh
/usr/include/ignition/math2/ignition/math/Vector3Stats.hh
/usr/include/ignition/math2/ignition/math/Vector4.hh
/usr/include/ignition/math2/ignition/math/config.hh
/usr/include/ignition/math2/ignition/math.hh
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/ignition-math2/
/usr/lib/x86_64-linux-gnu/cmake/ignition-math2/ignition-math2-config-version.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-math2/ignition-math2-config.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ignition-math2.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libignition-math2-dev/
/usr/share/doc/libignition-math2-dev/copyright
/usr/lib/x86_64-linux-gnu/libignition-math2.so
/usr/share/doc/libignition-math2-dev/changelog.Debian.gz