You added it via a ppa? I haven't done this I just usually d/l from the web page and it installs automatically using the python script.
The script is "sudo python -c "import urllib2; exec urllib2.urlopen('http://status.calibre-ebook.com/linux_installer').read();main()" just run it in a terminal or change the sudo to gksudo and run it via alt-f2.
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