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Once again
On linux MTP devices can only be accessed by a single program at a time. You need to find whatever in your OS is claiming the tablet automatically (most likely your desktop shell/file manager) and disable it.
The relevant line in the log is:
ignoring libusb_claim_interface() = -6PTP_ERROR_IO: failed to open session, trying again after resetting USB interface
This has nothing to do with calibre, everything to do with your OS. I have no idea how to find what is claiimng the device on your OS, like I said, I stopped using linux desktop environments years ago. You will have to ask about that in the support forums for whatever desktop environment you are using.
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