The procedure for enabling Livepatch has been improved and using this page is no longer required. To enable Livepatch please follow the instructions at
Canonical Livepatch Service
Managed live kernel patching
Personal users of Ubuntu can subscribe three machines (laptop, server or cloud) free of charge. Canonical's customers are entitled to use the service on every system for which a product including Livepatch is active, including those covered by an Ubuntu Advantage enterprise support agreement (Essential, Standard, or Advanced).