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That's a crash inside the Qt 5 xcb plugin. Unfortunately, there isn't much I can do to help with that. Most likely, it is caused by something in your environment not being as Qt expects. General suspects are video/X drivers.
I suggest using calibre 1.48 (which uses Qt 4) for the time being on your system. There are several crashing bugs in Qt 5 on linux that will (hopefully) be fixed soon.
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