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I installed Kubuntu 15.04 64 bit in a Virtual Machine and updated it. I then installed Calibre 2.30, exported some azw3 files without drm from my main installation of Calibre and imported them to the new empty library on the virtual machine. There was no problem whatsoever with the dialogs, and the import was successful. Admittedly, it is a Vanilla install with no extra plugins. Not even Alf's tools.
It seems almost certain that the problem is not with any part of Calibre, nor with Kubuntu in general. It is likely due to something broken in your system, probably with QT. I do notice that there is a qt-plugins directory under /opt/calibre/lib, but this is presumably completely replaced with every update, so I doubt this could be causing the problem. Are there problems with dialogs generally, or only with Calibre? I gather your Kubuntu system is completely up to date? Also, give it a try with Calibre 2.30. If it was my system at this stage I would probably be looking at a complete reinstallation of QT, and considering a full reinstall if this does not work.
Sorry, but I too am pretty well out of any further ideas.
On another note, I hadn't played with either Debian or any of its derivatives for some time. Kubuntu is still a very nice distro.
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