Tried Safe mode, PRAM reset
What worked for me:
Boot into Recovery
Start Security Startup Security Utility and set Medium Security. See https://support.apple.com/en-us/HT208198
Reboot and upgrade.
Go back and set High Security (if required)
schafdog
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Same problem for me. I also had the problem with 11.2. Tried in safe mode, no "luck".
Some "suggests" that resetting NVM can fix it. Other says the "solution" is to do a reinstall. But these is work-arounds and not fixes.
Apple, Wake up and fix your update process. At least acknowledge the issue!