What version are you running on Ubuntu? If you got it through the repository, it's too old and won't generate Sony periodicals. Sony periodicals support is implemented in Calibre versions 0.7.25 or later.
You can install the latest version of Calibre with this command line:
Code:
sudo python -c "import urllib2; exec urllib2.urlopen('http://status.calibre-ebook.com/linux_installer').read(); main()"
It's not a .deb package but it installs neatly in /opt, so you can remove it at any time. Just remember to uninstall the Calibre package from the Ubuntu repository before installing the latest version manually.