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I believe I have found the cause for this problem. When I first installed Calibre on this computer, I accidentally installed the DeDRM plugin, but then remembered that I only needed it on the Windows version, not the Linux version, so I uninstalled it. However, it must have left some this remnant of itself.
I checked my alternate Mint install, and it worked normally. Then, I fired up my Windows VM that has the DeDRM plugin, and sure enough, it had this problem.
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