To get started with Docker on Ubuntu, make sure you meet the prerequisites, then install
Linux isn’t a complete operating system — it’s just a kernel. Linux distributions take the Linux kernel and combine it with other free software to create complete packages. There are many different Linux distributions out there.
If you want to “install Linux,” you’ll need to choose a distribution. You could also use Linux From Scratch to compile and assemble your own Linux system from the ground up, but that’s a huge amount of work.
Linux is the best-known and most-used open source operating system. As an operating system, Linux is software that sits underneath all of the other software on a computer, receiving requests from those programs and relaying these requests to the computer’s hardware.