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How to Fix Error 0x80070643 When Windows Update Fails - Fix NO_PUBKEY error during apt update on Ubuntu-Windows Security Service Failed to Start: Guide

2026-06-13 14:55:30office-tools
How to Fix Error 0x80070643 When Windows Update Fails - Fix NO_PUBKEY error during apt update on Ubuntu-Windows Security Service Failed to Start: Guide

Final checklist

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