When installing python-numpy, python-numpy-ext and python-scipy, and when testing the installed packages with a python -c "import scipy as S; S.test()", errors are reported concerning scipy.lib.lapack:
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WARNING: clapack module is empty
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See scipy/INSTALL.txt for troubleshooting.
Notes:
* If atlas library is not found by numpy/distutils/system_info.py,
then scipy uses flapack instead of clapack.
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Why does the numpy package of ubuntu depend on atlas3-base, but building the package reports a conflict with atlas3-base ? I think this may be somewhat related (if the numpy package is not built with atlas3, then scipy cannot find the atlas informations)
If I rebuild numpy and scipy packages with atlas installed, and overwritting dependency checking in dpkg-buildpackage, the issues seems to disappear, which seems to imply that the above remark on numpy/atlas is valid
Confirmed with the new python-numpy package in Feisty.