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How to Fix Ubuntu APT Lock Error: Could Not Get Lock - Windows Defender Setup Steps for Small Offices-Stop Windows Defender Login Loop After Recent Update

Updated 2026-06-13 13:28:22macos-help
How to Fix Ubuntu APT Lock Error: Could Not Get Lock - Windows Defender Setup Steps for Small Offices-Stop Windows Defender Login Loop After Recent Update
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.