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You can only upgrade from LTS to LTS, or to the next 6-monthly release. While you may attempt to do something else, it is NOT supported. To upgrade from 14.04 LTS, then either wait for 16.04 LTS (April 2016) or try a new install of 15.10 on a separate partition/drive (or spare platform). Do not attempt to upgrade from 14.04 LTS directly to 15.10.
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