Presumably this happens if dbus-python doesn't manage to introspect the
credentials interface, so it doesn't know how to marshal the empty
dictionary.
I'm not sure why this would happen for some people and not others, but
we could probably work around it by passing dbus.Dictionary({},
signature='ss') to find_credentials() instead (or whatever the signature
is meant to be).
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https://bugs.launchpad.net/bugs/711162
Title:
ubuntuone-login crashed with ValueError in call_async(): Unable to
guess signature from an empty dict
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