/usr/share/python-support/python-matplotlib-dbg.public is in python-matplotlib-dbg 1.1.1~rc1+git20120423-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/usr/lib/pyshared/python2.7/matplotlib/_cntr_d.so
/usr/lib/pyshared/python2.7/matplotlib/_delaunay_d.so
/usr/lib/pyshared/python2.7/matplotlib/_image_d.so
/usr/lib/pyshared/python2.7/matplotlib/_path_d.so
/usr/lib/pyshared/python2.7/matplotlib/_png_d.so
/usr/lib/pyshared/python2.7/matplotlib/_tri_d.so
/usr/lib/pyshared/python2.7/matplotlib/backends/_backend_agg_d.so
/usr/lib/pyshared/python2.7/matplotlib/ft2font_d.so
/usr/lib/pyshared/python2.7/matplotlib/nxutils_d.so
/usr/lib/pyshared/python2.7/matplotlib/ttconv_d.so
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