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Home / developer-tools / PowerShell Connection Refused: Troubleshooting Checklist - Windows Defender Definition Update Failed: Practical Fixes-How to Fix Ubuntu APT Lock Error by Removing /var/lib/apt/lists/lock

PowerShell Connection Refused: Troubleshooting Checklist - Windows Defender Definition Update Failed: Practical Fixes-How to Fix Ubuntu APT Lock Error by Removing /var/lib/apt/lists/lock

2026-06-13 18:38:56developer-tools
PowerShell Connection Refused: Troubleshooting Checklist - Windows Defender Definition Update Failed: Practical Fixes-How to Fix Ubuntu APT Lock Error by Removing /var/lib/apt/lists/lock

Final checklist

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