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This looks like a simple permission problem on the relevant use device. I'm not sure about the Ubuntu version, but can you check whether you are in the plugdev group? (Typing 'id' should show you which user I'd and which group you belong to). The plugdev group members normally have read/write permissions.
If that doesn't help, then probably the device is not recognized as ebook reader and udev does not assign the correct permissions when the device files are created.
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