Ubuntu 10.04 - Python multiprocessing - 'module' object has no attribute 'local' error

Question

The following code is from the python 2.6 manual.

from multiprocessing import Process
import os

def info(title):
    print(title)
    print('module name:', 'me')
    print('parent process:', os.getppid())
    print('process id:', os.getpid())

def f(name):
    info('function f')
    print('hello', name)

if __name__ == '__main__':
    info('main line')
    p = Process(target=f, args=('bob',))
    p.start()
    p.join()

This creates the following stack traces:

Traceback (most recent call last):
  File "threading.py", line 1, in <module>
    from multiprocessing import Process
  File "/usr/lib/python2.6/multiprocessing/__init__.py", line 64, in <module>
    from multiprocessing.util import SUBDEBUG, SUBWARNING
  File "/usr/lib/python2.6/multiprocessing/util.py", line 287, in <module>
    class ForkAwareLocal(threading.local):
AttributeError: 'module' object has no attribute 'local'
Exception AttributeError: '_shutdown' in <module 'threading' from '/home/v0idnull/tmp/pythreads/threading.pyc'> ignored
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/lib/python2.6/multiprocessing/util.py", line 258, in _exit_function
    info('process shutting down')
TypeError: 'NoneType' object is not callable
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/usr/lib/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/lib/python2.6/multiprocessing/util.py", line 258, in _exit_function
    info('process shutting down')
TypeError: 'NoneType' object is not callable

I'm completely clueless as to WHY this is happening, and google has given me very little to work with.