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==Keep the operating system secured== <!--T:3--> | ==Keep the operating system secured== <!--T:3--> | ||
* Apply security updates. | * Apply security updates on a regular basis. | ||
* Avoid using packages from unknown sources. | * Avoid using packages from unknown sources. | ||
* Use a recent image. For example, don't use Ubuntu 14.04 when Ubuntu 16.04 is available. | * Use a recent image. For example, don't use Ubuntu 14.04 when Ubuntu 16.04 is available. |