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Fix Ubuntu apt update GPG error: repository not signed - Docker Desktop Stuck on 'Starting' Forever: Troubleshooting Checklist-How to Start Windows Defender Service

2026-06-13 12:36:25setup-checklists
Fix Ubuntu apt update GPG error: repository not signed - Docker Desktop Stuck on 'Starting' Forever: Troubleshooting Checklist-How to Start Windows Defender Service

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.