Ubuntu 18.10 (Cosmic Cuttlefish) was released on 18 October 2018 and reached End of life on 18 July 2019. Questions specific to this version are generally off-topic now.
On 8 May 2018, Mark Shuttleworth announced that the codename of Ubuntu 18.10, which was released on 18 October 2018, would be Cosmic Cuttlefish.The Ubuntu 18.10 installation includes a new theme, named Yaru and the new icon theme, Suru. Installation speeds are faster due to a lossless compression algorithm known as Zstandard. Startup speeds of pre-installed Snap applications were also improved.