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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. Then your tablet will work fine with calibre.
{rant}
Personally, I gave up on linux desktop environments a long time ago. They are full of boneheaded decisions like taking control of MTP devices without permission from the user and then mounting them as a pseudo-filesystem -- never mind the fact that MTP is not and cannot be mapped to a filesystem, as it has fundamentally different semantics.
So instead of doing the hard work of creating a daemon to multiplex MTP access (equivalent to the windows portable device service) the desktop environments just happily claim the device and map it to a filesystem because that's the least effort path, and be damned to the consequences.
{endrant}
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