Canonical has warned of the imminent expiration of the five-year update period for its distribution. Ubuntu 16.04 LTS. Official public support for the distribution begins on April 30, 2021. Ubuntu It will be discontinued on April 16.04. For users who don't have time to migrate their systems to Ubuntu On April 18.04 or April 20.04, as with previous LTS releases, the ESM (Extended Security Maintenance) program is offered, extending the release of updates that address vulnerabilities for the kernel and critical system packages until April 2024. Access to ESM updates is limited to paid technical support subscribers.
Source: opennet.ru