I dig deeper. Now another error. Cursing at the lack of fonts.

~/MyDocs/murrine-0.90.3 $ sudo python ~/MyDocs/surface3d_dem
o.py
/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py:198:
GtkWarning: Загружаемый модуль тем не найден в
module_path: "murrine",
gtk.DrawingArea.__init__(self)
/usr/lib/python2.5/site-packages/matplotlib/font_manager.py:1242:
UserWarning: findfont: Font family ['sans-serif'] not
found. Falling back to Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext]))
/usr/lib/python2.5/site-packages/matplotlib/font_manager.py:1252:
UserWarning: findfont: Could not match
:family=Bitstream Vera
Sans:style=normal:variant=normal:weight=normal:str etch=normal:size=medium.
Returning
/usr/share/matplotlib/mpl-data/fonts/ttf/cmb10.ttf
UserWarning)