The latest LTS version of Ubuntu is Ubuntu 18.04 LTS “Bionic Beaver"
The latest LTS version of Ubuntu is Ubuntu 18.04 LTS “Bionic Beaver,” which was released on April 26, 2018. Canonical releases new stable versions of Ubuntu every six months, and new Long Term Support versions every two years. https://www.howtogeek.com/351177/what-is-the-latest-version-of-ubuntu/