Kubuntu is up to date - I have the backport ppa alerting me. Plasma is 5.3.1.
All the last few fresh installs of calibre that I have tried are all 2.30.
I hear what you say - completely remove Qt & bring it up again. Sounds scary - last time I just moved the qt plugin folders and there was quite a lot of strange behaviour. But perhaps I will give it a try.
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