thanks kovidgoyal for your prompt advice.
I'd be glad to do what you suggest, though a) I think I tried that before and for some reason I had to re-install the package provided by Ubuntu (conversion wouldn't work on the official calibre package), b) it's the first time I've been unable to convert AZW3 books on the 0.8.70 version. I've just converted two other AZW3 books no problem...
Sorry I'm confused. Why do you think I should replace Calibre?
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