I installed GNU Radio via the Ubuntu package first, and when trying to run usrp2_probe, i got the error "ImportError: cannot import name usrp2" ... so then I tried a manual install from the latest git, and I still get that same error.
I have confirmed that gnuradio exists in: /usr/local/lib/python2.6/dist-packages/gnuradio
I see the usrp2 module here: -rw-r--r-- 1 root staff 58800 2010-04-21 14:34 /usr/local/lib/python2.6/dist-packages/gnuradio/usrp2.py
/usr/local/lib/python2.6/dist-packages is in the sys.path variable in python: >>> sys.path ['', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages/Numeric', '/usr/lib/python2.6/dist-packages/PIL', '/usr/lib/python2.6/dist-packages/gst-0.10', '/usr/lib/pymodules/python2.6', '/usr/lib/python2.6/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.6/gtk-2.0', '/usr/lib/python2.6/dist-packages/wx-2.6-gtk2-unicode', '/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode', '/usr/local/lib/python2.6/dist-packages']
**NOTE** I do not get the import error when I do not run the command with sudo, but then I do not get the proper raw socket permissions. Maybe that rings a bell to someone? Something probably about an environment variable I am missing.