Please update the operating system (OS) version for your Cloud Service to the most recent version available for your OS family. ...

Please update the operating system (OS) version for your Cloud Service to the most recent version available for your OS family. You can do this manually by editing the service config file, or by choosing the "Automatic" option for OPERATING SYSTEM VERSION in the Azure Classic Portal to enable automatic updates to the current OS version. In the current (not classic) Azure portal, you will need to update the service config file (cscfg). Changes to the OS version for a Cloud Service are applied to all role instances in the service.