Booted again to USB and continued like usual. With a wifi or ethernet connection it went through the installer update and was happy. It failed until the internet connection was established. Apparently the installer needs to peek at Mac server to see if it knows the Mac is enrolled in a management scheme and update, or it may be confused by mac T2 chip. Choose to boot from USB Key - On this attempt, there was a message stating "A software update required to use this startup disk".Press Option Key as soon as u see the Mac apple.Create USB boot stick with free program DiskMaker X.Download Catalina from Apple Store to a working Mac.Either way, the main disable happen from recovery mode. It used a USB for fresh install but the process may also work with a recovery mode configuration on a mac that is running already. Additional Information: /System/Library/CoreServices/RemoteManagement/ARDAgent.This process worked to get a 2018 mac from eBay working with fresh install Catalina. Removed preference to start ARD after reboot. Solution Perform the following to disable Remote Management: Graphical Method: Open System Preferences Select Sharing Uncheck Remote Management Terminal Method: Run the following command to disable Remote Management: $ sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -deactivate -stop Starting. Impact: Many organizations utilize ARD for client management. Mobile devices without strict controls are vulnerable to exploit and monitoring. Rationale: Remote Management should only be enabled on trusted networks with strong user controls present in a Directory system. Computers will be available on port 5900 on a macOS System and could accept connections from untrusted hosts depending on the configuration, definitely a concern for mobile systems. Remote Management should only be enabled when a Directory is in place to manage the accounts with access. If Remote Management is used, refer to the Screen Sharing section above on issues regard screen sharing. In fact, only one of the two can be configured. The screen sharing options in Remote Management are identical to those in the Screen Sharing section. Remote Management can be used by remote administrators to view the current screen, install software, report on, and generally manage client Macs. Information Remote Management is the client portion of Apple Remote Desktop (ARD).
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