Same problem. Related to encrypted volume. Reboot into recovery mode, select your startup disk unlock it with your password. Once it restarts, then you can upgrade again.
ccantrell
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Fixed by going into recovery mode and unlocking the startup disk. Problem seems related to encrypted volumes.
Thanks! Worked for me as well
Is apple or anyone monitoring these treads?
Same issue for me. It looks related to bluetooth. If you plug in the keyboard, it goes away. I removed and re-added my keyboard and the problem still exists.