[Bugs] #1016 UNSP: journal can fail to mount a usb key with UnpicklingError

[SugarLabs Bugs]

#1016: journal can fail to mount a usb key with UnpicklingError
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    Reporter:  jpritikin                  |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  journal                    |        Version:  0.82.x                     
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 Build 802

 See attached python traceback from the JournalActivity log.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1016>
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