Here you can download the official Ubuntu 18.10 “Cosmic Cuttlefish” ISO for free.
Shuttleworth announced Ubuntu 18.10 Cosmic Cuttlefish on 8 May 2018. It was released on 18 October 2018. Installation speeds are faster due to the use of a lossless compression algorithm known as Zstandard. Startup speeds of pre-installed Snap applications were also improved.
Ubuntu 18.10 includes a new theme, Yaru, as the default theme, along with its accompanying icon theme, Suru.
Desktop image
The desktop image allows you to try Ubuntu without changing your computer at all, and at your option to install it permanently later. This type of image is what most people will want to use. You will need at least 1024MiB of RAM to install from this image.
64-bit PC (AMD64) desktop image
Choose this if you have a computer based on the AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). If you have a non-64-bit processor made by AMD, or if you need full support for 32-bit code, use the i386 images instead. Choose this if you are at all unsure.
Server install image
The server install image allows you to install Ubuntu permanently on a computer for use as a server. It will not install a graphical user interface.
64-bit PC (AMD64) server install image
Choose this if you have a computer based on the AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). If you have a non-64-bit processor made by AMD, or if you need full support for 32-bit code, use the i386 images instead. Choose this if you are at all unsure.
