/usr/ is in libignition-math4-dev 4.0.0+dfsg1-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/ignition/
/usr/include/ignition/math4/
/usr/include/ignition/math4/ignition/
/usr/include/ignition/math4/ignition/math/
/usr/include/ignition/math4/ignition/math/Angle.hh
/usr/include/ignition/math4/ignition/math/Box.hh
/usr/include/ignition/math4/ignition/math/Color.hh
/usr/include/ignition/math4/ignition/math/Export.hh
/usr/include/ignition/math4/ignition/math/Filter.hh
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/usr/include/ignition/math4/ignition/math/Inertial.hh
/usr/include/ignition/math4/ignition/math/Kmeans.hh
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/usr/include/ignition/math4/ignition/math/Matrix4.hh
/usr/include/ignition/math4/ignition/math/OrientedBox.hh
/usr/include/ignition/math4/ignition/math/PID.hh
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/usr/include/ignition/math4/ignition/math/Pose3.hh
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/usr/include/ignition/math4/ignition/math/Rand.hh
/usr/include/ignition/math4/ignition/math/RotationSpline.hh
/usr/include/ignition/math4/ignition/math/SemanticVersion.hh
/usr/include/ignition/math4/ignition/math/SignalStats.hh
/usr/include/ignition/math4/ignition/math/SphericalCoordinates.hh
/usr/include/ignition/math4/ignition/math/Spline.hh
/usr/include/ignition/math4/ignition/math/Temperature.hh
/usr/include/ignition/math4/ignition/math/Triangle.hh
/usr/include/ignition/math4/ignition/math/Triangle3.hh
/usr/include/ignition/math4/ignition/math/Vector2.hh
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/usr/include/ignition/math4/ignition/math/detail/
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/usr/include/ignition/math4/ignition/math/graph/
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/usr/include/ignition/math4/ignition/math/graph/Vertex.hh
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/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/ignition-math4/
/usr/lib/x86_64-linux-gnu/cmake/ignition-math4/ignition-math4-config-version.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-math4/ignition-math4-config.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-math4/ignition-math4-targets-relwithdebinfo.cmake
/usr/lib/x86_64-linux-gnu/cmake/ignition-math4/ignition-math4-targets.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ignition-math4.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libignition-math4-dev/
/usr/share/doc/libignition-math4-dev/copyright
/usr/lib/x86_64-linux-gnu/libignition-math4.so
/usr/share/doc/libignition-math4-dev/changelog.Debian.gz