As an alternative to the online update via WebConfig or switching off ArchivistaBox there, the update can also be carried out via the console:
/etc/archivista/onlineupdate.sh 1
The '1' at the end is necessary to start the update. After some time (the ArchivistaBox contains approx. 2 GByte) some status messages are displayed. After this, the ArchivistaBox can be restarted with 'shhutdown now -r'.