Comment 17 for bug 667017

here is my error message

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 779, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 861, in _simulate_helper
    self._cache)
  File "/usr/lib/python2.6/dist-packages/apt/debfile.py", line 57, in __init__
    self.open(filename)
  File "/usr/lib/python2.6/dist-packages/apt/debfile.py", line 66, in open
    self._debfile = apt_inst.DebFile(open(self.filename))
IOError: [Errno 2] No such file or directory: '/tmp/nautilus-dropbox_0.6.7_i386.deb'