$ hg
Traceback (most recent call last):
  File "/usr/bin/hg", line 27, in <module>
    mercurial.dispatch.run()
  File "/usr/lib/python2.5/site-packages/mercurial/dispatch.py", line 16, in run
    sys.exit(dispatch(sys.argv[1:]))
  File "/usr/lib/python2.5/site-packages/mercurial/dispatch.py", line 21, in dispatch
    u = _ui.ui()
  File "/usr/lib/python2.5/site-packages/mercurial/ui.py", line 35, in __init__
    for f in util.rcpath():
  File "/usr/lib/python2.5/site-packages/mercurial/util.py", line 1171, in rcpath
    _rcpath = os_rcpath()
  File "/usr/lib/python2.5/site-packages/mercurial/util.py", line 1146, in os_rcpath
    path = system_rcpath()
  File "/usr/lib/python2.5/site-packages/mercurial/posix.py", line 42, in system_rcpath
    '/../etc/mercurial'))
  File "/usr/lib/python2.5/site-packages/mercurial/posix.py", line 31, in rcfiles
    for f, kind in osutil.listdir(rcdir)
  File "/usr/lib/python2.5/site-packages/mercurial/demandimport.py", line 75, in __getattribute__
    self._load()
  File "/usr/lib/python2.5/site-packages/mercurial/demandimport.py", line 47, in _load
    mod = _origimport(head, globals, locals)
ImportError: No module named osutil