Effective immediately, the new release of Ubuntu, 17.10, aka 'Artful Aardvark' has been released [ubuntu.com]!
This release will be supported for 9 months (until 2018 [ubuntu.com]) for Long Term Support, stick with release 16.04, instead.
Official flavors (e.g. Kubuntu) are also released.
See the above release notes for a full list of changes and where you can get a copy.
[Full disclosure: the majority of SoylentNews' servers run Ubuntu 16.04 LTS though we have taken steps towards moving to Gentoo.]