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Kovidgoyal,
Tried from Kindle menu:
reboot
full reset
Tried few good USB cables.
Just copy files is ok even on 1Gb file.
Then I search for bugs and found few links: kernel bug (no fix), calibre bug (you asked which version and unable to repeat on your version).
Only 1 solution work:
echo "write through" > /sys/block/<dev>/queue/write_cache
Then run Calibre and successfully uploaded books.
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