I am using Calibre in Mint Linux.
I always install from official Calibre page.
You copy and paste one line.
Quote:
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sudo python -c "import urllib2; exec urllib2.urlopen('http://status.calibre-ebook.com/linux_installer').read(); main()"
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You might want to uninstall Calibre you installed from Ubuntu repositories, because Calibre from official pages installs to /opt directory by default. Then it places symlinks for Calibre binaries to /usr/bin