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That version of Calibre is horribly out-of-date as the current version (0.7.50) is over 30 releases later. At the rate Calibre develops with weekly updates that is an eternity. Any discussions in these forums will always assume you are running a recent release.
It sounds as if you have installed Calibre from the Ubuntu repositories? If you want to use some of the more recently added feaures, you may be better off getting Calibre directly from its home site and using the binary install method specified on the download page for Linux.
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