Yes folks, after such a terrible delay we finally managed to get it correct. calligra 1:2.6.1-0ubuntu5 is now available in raring-release and it should now fully work. Sorry for such delay.
Report to us at firstname.lastname@example.org if you still have any problems after upgrading.
We will start backporting the release to Kubuntu 12.10 and Kubuntu 12.04.2 LTS in the Kubuntu Backports PPAs.