I am trying to install sage on my ubuntu system. But the following
errors occur. I don't know why. I installed successfully last time
using the same method. I installed a new system so I have to install
sage again. But this time it does not work. Thank you very much.

  File "/home/li/sage/sage-4.7-linux-32bit-ubuntu_10.04_lts-i686-Linux/
local/lib/python2.6/site-packages/sage/functions/transcendental.py",
line 40, in <module>
    import sage.plot.all
  File "/home/li/sage/sage-4.7-linux-32bit-ubuntu_10.04_lts-i686-Linux/
local/lib/python2.6/site-packages/sage/plot/all.py", line 23, in
<module>
    from complex_plot import complex_plot
  File "numpy.pxd", line 149, in init sage.plot.complex_plot (sage/
plot/complex_plot.c:7369)
  File "/home/li/sage/sage-4.7-linux-32bit-ubuntu_10.04_lts-i686-Linux/
local/lib/python2.6/site-packages/numpy/__init__.py", line 136, in
<module>
    import add_newdocs
  File "/home/li/sage/sage-4.7-linux-32bit-ubuntu_10.04_lts-i686-Linux/
local/lib/python2.6/site-packages/numpy/add_newdocs.py", line 9, in
<module>
    from numpy.lib import add_newdoc
  File "/home/li/sage/sage-4.7-linux-32bit-ubuntu_10.04_lts-i686-Linux/
local/lib/python2.6/site-packages/numpy/lib/__init__.py", line 13, in
<module>
    from polynomial import *
  File "/home/li/sage/sage-4.7-linux-32bit-ubuntu_10.04_lts-i686-Linux/
local/lib/python2.6/site-packages/numpy/lib/polynomial.py", line 11,
in <module>
    import numpy.core.numeric as NX
AttributeError: 'module' object has no attribute 'core'
make: *** [doc-html] 错误 1

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