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leo@leo-Lenovo-G580:~$ sudo dropbox update
[sudo] password for leo:
/usr/bin/dropbox:364: GtkWarning: IA__gtk_progress_set_percentage: assertion `percentage >= 0 && percentage <= 1.0' failed
  self.progress.set_fraction(fraction)
Traceback (most recent call last):
  File "/usr/bin/dropbox", line 374, in handle_data_waiting
    progress, status = self.one_chunk.next()
  File "/usr/bin/dropbox", line 211, in download_file_chunk
    buf.write(chunk)
  File "/usr/lib/python2.7/StringIO.py", line 213, in write
    _complain_ifclosed(self.closed)
  File "/usr/lib/python2.7/StringIO.py", line 40, in _complain_ifclosed
    raise ValueError, "I/O operation on closed file"
ValueError: I/O operation on closed file
Traceback (most recent call last):
  File "/usr/bin/dropbox", line 1404, in <module>
    ret = main(sys.argv)
  File "/usr/bin/dropbox", line 1393, in main
    result = commands[argv[i]](argv[i+1:])
  File "/usr/bin/dropbox", line 817, in update
    download()
  File "/usr/bin/dropbox", line 504, in download
    raise Exception("user cancelled download!!!")
Exception: user cancelled download!!!