Ok, I was able to reproduce this under the following conditions:

1. ubuntuone-syncdaemon had file synchronization disabled.
2. A call was made to Ubuntu One SyncDaemon DBus API that triggered the 
syncdaemon to be started.
3. libsyncdaemon in nautilus plugin was listening to NameOwnerChange event from 
DBus
4. syncdaemon starts up, aquires DBus name, finds that file sync is disabled 
and shuts down
5. nautilus found that syncdaemon is starting and queued some calls to /status
6. SyncDaemon is being restarted
7. I log out from the session, session manager tells me that File Manager 
(nautilus) is very busy
8. I log in back to the session and 
/var/crash/_usr_lib_ubuntuone-client_ubuntuone-syncdaemon.1000.crash has 
appeared with the date/time corresponding to my logout.

Exception:
 DBusException: org.freedesktop.DBus.Error.NoServer: Failed to connect to 
socket /tmp/dbus-NjgqXdjDbh: Connection refused

But this dbus session is not valid:
$ echo $DBUS_SESSION_BUS_ADDRESS 
unix:abstract=/tmp/dbus-hNCmBsQZMX,guid=14abeb90782bd46a03e00a4d00000084

Does anybody who experience this issue have File Synchronization
disabled?

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https://bugs.launchpad.net/bugs/420705

Title:
  ubuntuone-syncdaemon crashed with DBusException in __new__()

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