If you have Ubuntu 16.04 and want to upgrade it to Ubuntu 18.04, then I recommend you to have a look at the below article.
Either a DVD drive or a USB port for the installer media.Make sure your system is good enough to run Ubuntu 18.04. READ: Top 10 New Features of Ubuntu 18.04 LTS System Requirements Xorg becomes the default display server.Ubuntu 18.04 LTS will receive support until 2023. Ubuntu releases new OS versions every six months with free support for nine months, and every fourth release would receive long-term support, up to five years from the date of release. Ubuntu has been favorite for desktop users for a long time, could see large-scale of deployments in the recent years. The latest LTS and current version of a most famous opensource desktop operating system from Canonical, released on April 26th, 2018.
