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Fix Windows Terminal Update Error 0x800f0954 - Windows Security Broken in Ubuntu Dual-Boot: Fix-How to Resolve Windows Defender Update Authentication Failure

2026-06-13 19:17:40office-tools
Fix Windows Terminal Update Error 0x800f0954 - Windows Security Broken in Ubuntu Dual-Boot: Fix-How to Resolve Windows Defender Update Authentication Failure

Final checklist

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