/usr/share/xfig/Libraries/Structural_Analysis/ is in xfig-libs 1:3.2.6a-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xfig/Libraries/Structural_Analysis/Beams/
/usr/share/xfig/Libraries/Structural_Analysis/Beams/beam_cantilever.fig
/usr/share/xfig/Libraries/Structural_Analysis/Beams/beam_fixed.fig
/usr/share/xfig/Libraries/Structural_Analysis/Beams/beam_simply_supported.fig
/usr/share/xfig/Libraries/Structural_Analysis/CoordSystems/
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/usr/share/xfig/Libraries/Structural_Analysis/CoordSystems/coordsys2D-2.fig
/usr/share/xfig/Libraries/Structural_Analysis/CoordSystems/coordsys2D_xy-1.fig
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/usr/share/xfig/Libraries/Structural_Analysis/CoordSystems/coordsys3D_xyz-3.fig
/usr/share/xfig/Libraries/Structural_Analysis/Loads/
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/usr/share/xfig/Libraries/Structural_Analysis/Loads/convection_short.fig
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/usr/share/xfig/Libraries/Structural_Analysis/Loads/uniform_axial_long.fig
/usr/share/xfig/Libraries/Structural_Analysis/Loads/uniform_axial_short.fig
/usr/share/xfig/Libraries/Structural_Analysis/Loads/uniform_long.fig
/usr/share/xfig/Libraries/Structural_Analysis/Loads/uniform_short.fig
/usr/share/xfig/Libraries/Structural_Analysis/Plates/
/usr/share/xfig/Libraries/Structural_Analysis/Plates/plate_fixed.fig
/usr/share/xfig/Libraries/Structural_Analysis/Plates/plate_fixed_hinge.fig
/usr/share/xfig/Libraries/Structural_Analysis/Plates/plate_hinge.fig
/usr/share/xfig/Libraries/Structural_Analysis/README
/usr/share/xfig/Libraries/Structural_Analysis/Supports/
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/usr/share/xfig/Libraries/Structural_Analysis/Supports/elastic_H_free_up.fig
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/usr/share/xfig/Libraries/Structural_Analysis/Supports/hinge_V_free_left.fig
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/usr/share/xfig/Libraries/Structural_Analysis/Trusses/
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/usr/share/xfig/Libraries/Structural_Analysis/Trusses/howe_triangle.fig
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/usr/share/xfig/Libraries/Structural_Analysis/Trusses/pratt_triangle.fig
/usr/share/xfig/Libraries/Structural_Analysis/Trusses/warren.fig