[igraph] Problem with python-igraph 0.5.2 installation on Ubuntu 9.04

[Domenico Conti]

I had install the follow libreries:
libigraph
libigraph-dev
python-igraph

from synaptic of Ubutnu 9.04. When I run: import igraph
into python prompt I have:
Traceback (most recent call last):
 File "test.py", line 1, in <module>
   import igraph
 File "/usr/lib/python2.6/dist-packages/igraph/__init__.py", line 30, 
in <module>
   from igraph.core import *
 File "/usr/lib/python2.6/dist-packages/igraph/igraph/__init__.py", 
line 48, in <module>
   class Graph(core.GraphBase):
NameError: name 'core' is not defined

HELP! HELP! HELP!