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I suspect your Fire HD 6 4th generation is using a MTP connection. Linux and MacOS devices can only have a single program accessing a MTP device. If it is mounted on your desktop, you must dismount it from Linux and then let calibre mount it. How to dismount it is dependant on your unspecified Linux distro. You can also look into disabling automount for your Linux distro.
Just as a sidenote, your 2014 Fire HD 6, if my memory is correct, was the first generation where Amazon dropped Kindle from the name.
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