It looks like the error is caused by the following bit of code in
aptdaemon/gtk3widgets.py:

        try:
            iter = self._download_map[uri]
        except KeyError:
            adj = self.get_vadjustment()

self.get_vadjustment() is returning None, probably because nothing has
called set_vadjustment.  This might actually be an error in update-
manager but I don't see anything having set that in update-manager
versions back to Precise.

** Changed in: aptdaemon (Ubuntu Saucy)
     Assignee: zhangwei (icanup) => (unassigned)

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https://bugs.launchpad.net/bugs/1024590

Title:
  update-manager crashed with AttributeError in _on_download_changed():
  'NoneType' object has no attribute 'get_value'

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