Your account has been identified as having started an instance or continuing to run instances of Ubuntu 16.04 over the last 6 months.
Canonical, the company behind Ubuntu, announced that the Ubuntu 16.04 LTS (Long Term Support) period will end on Friday, April 30, 2021 [1].
Canonical offers ESM for Ubuntu 16.04 LTS, which guarantees an additional three years of security patches. ESM is included with Ubuntu Pro 16.04 instances, or free Ubuntu instances with an attached Ubuntu Advantage subscription[2][3].
All Ubuntu 16.04 LTS users are encouraged to upgrade to Ubuntu 18.04 LTS or Ubuntu 20.04 LTS.
Should you have any questions or concerns, the AWS Support Team is available on the community forums and via Premium Support [4][5].
[1] https://ubuntu.com/blog/ubuntu-16-04-lts-esm-migration-path
[2] https://aws.amazon.com/marketplace/pp/Amazon-Web-Services-Ubuntu-Pro-1604-LTS/B0821WW873
[3] https://ubuntu.com/advantage
[4] https://forums.aws.amazon.com
[5] https://aws.amazon.com/support
Sincerely,
Amazon Web Services