Released five years ago on April 16th, 2016, the Ubuntu 16.04 LTS (Xenial Xerus) operating system series will reach end of life on April 30th, 2021, when it will enter the Extended Security Maintenance (ESM) support, which is offered by Canonical to companies who want to continue using the OS but need it to remain secure.
Following on the success of the Ubuntu 12.04 LTS (Precise Pangolin) and Ubuntu 14.04 LTS (Trusty Tahr) operating systems, Canonical is kicking off the transition to its Extended Security Maintenance (ESM) commercial package for Ubuntu 16.04 LTS (Xenial Xerus) on April 30th, 2021.