I was about to upgrade my Mac Pro (running Mojave) to Big Sur, but when I run 
the Big Sur installer and select the APFS (encrypted) boot drive, it says: 

   You may not install to this volume because it has a disk password.

How do I turn off the disk password? Or is it complaining that the drive is 
encrypted?

I go into Sys Prefs -> Security -> FileVault and click on the lock icon, and 
then click on "Turn Off FileVault..."  But the button does nothing. It turns 
blue when clicked, but nothing happens, no panel opens, ... nothing.

The console log has this:

  ODNodeCustomFunction failed with result ODErrorCredentialsNotAuthorized
  SetFrontProcessInternal(0x0,0x1fa1fa pid2520) error=-606 so failed
  Authentication failed for <private> with ODErrorCredentialsInvalid
  ODRecordVerifyPassword failed with result ODErrorCredentialsInvalid


The diskutil info for the drive is:

    +-> Volume disk1s1 D798F143-8BC1-40FE-97AB-74396129744B
    |   ---------------------------------------------------
    |   APFS Volume Disk (Role):   disk1s1 (No specific role)
    |   Name:                      Macintosh HD (Case-insensitive)
    |   Mount Point:               /
    |   Capacity Consumed:         351754764288 B (351.8 GB)
    |   FileVault:                 Yes (Unlocked)

I assume I can re-encrypt my boot drive after I've installed Big Sur, but how 
do I turn it off (or turn off the disk password) for the installation? Or is 
this not what it's complaining about?

-Carl

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