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The next question I have is whether it is a problem with Kubuntu 15.04 generally or whether your system has become broken in some respect. I'm going to download Kubuntu 15.04 and when I get the chance I will install it in a virtual machine and see if I can duplicate your problem. If anyone else is running an up to date Kubuntu 15.04 please post whether you are able to add books in Calibre. As the binary install of Calibre includes most if not all of its dependencies including Python the problem seems to be, as Kovid pointed out, "in the QT system integration". Currently Calibre uses QT5.
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