Problem installing GNU-radio in ubuntu 11.10

Hello, I installed gnuradio in ubuntu 11.10 using the build gnu-radio
script
(http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGR).
But when execute a Python example (such as usrp_oscope.py), I have an
error:

jose@jose-HP-G62-Notebook-PC:~/gnuradio/gr-usrp/src/python$
./usrp_oscope.py
Traceback (most recent call last):
File “./usrp_oscope.py”, line 26, in
from gnuradio import usrp
ImportError: cannot import name usrp

I suppose than I need to reconfigure de path, but I don’t know how.

Please, help