I have recently downloaded Raspbian X86_64 to learn to program basic thing on a Raspberry Pi. I installed it on my NETBOOK in DUAL-BOOT mode only to learn very quickly that to use it as the main OS it was very restrictive for what I wanted to do that wasn’t related to Raspberry Pi stuff and so looked for something similar.
I then Downloaded Ubuntu 18.04 LTS and installed in Dual-Boot mode replacing the Raspian OS. Both Raspbian and Ubuntu are based on DEBIAN a leading Linux version.
Or if you want to try Ununtu, you can download it HERE