Ubuntu
python-numpy package

python-numpy fails to import

Asked by Tobias Gresch

Hello,

I am trying to import numpy in python after upgrading from hardy to intrepid:

toby@ubuntu:~$ python
Python 2.5.2 (r252:60911, Aug 6 2008, 09:17:42)
[GCC 4.3.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/site-packages/numpy/__init__.py", line 103, in <module>
    import linalg
  File "/usr/lib/python2.5/site-packages/numpy/linalg/__init__.py", line 4, in <module>
    from linalg import *
  File "/usr/lib/python2.5/site-packages/numpy/linalg/linalg.py", line 29, in <module>
    from numpy.linalg import lapack_lite
ImportError: /usr/lib/atlas/liblapack.so.3gf: undefined symbol: _gfortran_pow_r8_i4
>>>

Apparently there is a linking problem, maybe related to bug: 261089 (Atlas blas and lapack libraries unware of gfortran dependency)

Can anybody reproduce this error or is it just my installation that is broken?

Best regards,
  Tobias Gresch

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Ubuntu python-numpy Edit question
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Solved by:
Albert Damen
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Revision history for this message
Best Albert Damen (albrt) said : 		#1

Yes, I can reproduce this on a clean i386 system. On an amd64 system all works fine.
The reason is atlas fails to build on i386, but was successfully built on amd64.
Therefore the libatlas3gf-base version you need is not available on i386 yet.

$ rmadison libatlas3gf-base
libatlas3gf-base | 3.6.0-21.1ubuntu3 | hardy/universe | amd64, i386
libatlas3gf-base | 3.6.0-21.1ubuntu3 | intrepid/universe | i386
libatlas3gf-base | 3.6.0-21.5ubuntu1 | intrepid/universe | amd64

And indeed, the new amd64 version depends on libgfortran3, the old i386 version does not.

Revision history for this message
Tobias Gresch (tobias-gresch) said : 		#2

Thanks Albert Damen, that solved my question.

Revision history for this message
Dmitry Petrov (demon-krasno) said : 		#3

I just want to add, that the line below solved the issue for me:

dpkg -l | grep atlas | awk {'print $2'} | xargs apt-get remove --purge -y

Revision history for this message
Ron Cadby (diefree) said : 		#4

I may have the same problem with my 10.4 Lucid install. I tried the Dmitry 'fix' but it didn't like the permissions, I guess. Not sure how to make it work.

I'm on a Dell Vostro 1000 that operates as 32 bit but has AMD 64 in it. Is that my problem?