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Try getting a stack trace with gdb, although since the binary has its symbols stripped, it might not be very useful.
From your description it looks like the Qt theme plugin on your system is incompatible with the version of Qt bundled with calibre, causing the crash. You can get calibre to not use the system theme plugin, edit ~/.config/calibre/gui.json and change 'ui_style' to 'calibre' from 'system'
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