Traceback (most recent call last):
  File "/usr/share/system-config-printer/my-default-printer.py", line 223, in <module>
    d = Dialog()
  File "/usr/share/system-config-printer/my-default-printer.py", line 130, in __init__
    _("_Set Default"), gtk.RESPONSE_OK))
  File "/usr/share/system-config-printer/my-default-printer.py", line 37, in handle_sigchld
    (pid, status) = os.wait ()
OSError: [Errno 10] No child processes