Old system extensions are interfering with a new antivirus installation.
Once the process is finished, Terminal will display a completion message. Close the window and restart your computer to clear any remaining cached files. Why Use This Instead of the Built-in Uninstaller?
You can download the official tool directly from Norton's servers. RemoveNortonMacFiles.zip How to Use the RemoveNortonMacFiles Tool
Once the RemoveNortonMacFiles.zip is downloaded, double-click it to unzip and open the folder.
If macOS blocks the file, go to System Settings > Privacy & Security , scroll to the bottom, and click Open Anyway next to the notification.