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Fix Ubuntu APT Lock File Permission Denied Error - Windows Command Prompt Cursor Not Showing Fix-Resolve Windows Defender Not Opening (Error 404)

2026-06-13 17:35:20cloud-software
Fix Ubuntu APT Lock File Permission Denied Error - Windows Command Prompt Cursor Not Showing Fix-Resolve Windows Defender Not Opening (Error 404)

Final checklist

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