Ubuntu 18.04 LTS Is Out — Wait for It — Now
Ubuntu 18.04 LTS (Bionic Beaver) is out today, after a short delay caused by a last-minute bug. The 18.04 release has been highly anticipated, since it is the first long-term-support (LTS) release since the switch back to GNOME as the default desktop environment for Ubuntu and the abandonment of Unity. Along with the glamour of a new desktop environment, 18.04 brings a new kernel, updated software packages, five years of support, and a multitude of other improvements. The new release also brings some controversy in the form of a new network manager. You can read the full release notes here, and you can grab Xubuntu 18.04, Kubuntu 18.04, Lubuntu 18.04, or any of the multitude of similarly updated Ubuntu variants.
The author has not tested 18.04 yet, but intends to do so as soon as he is finished messing about with CentOS and can be bothered to spin up a virtual machine.