If you like to test or run different operating systems on virtualization software like Virtualbox or VMWare, you might be happy to learn that you can download ready to go installations of operating systems ready to import and run.
You don't need to wait for your operating system to install. Now you can just download an already installed image of your OS and run it.
I like Virtualbox, but you can also download VMWare images.
The site to go to for getting these ready to run operating systems is called OSBoxes.com.
The list of available OS's for download is long, and includes Ubuntu and Fedora, along with other popular systems, and even less known names like Deepin and Korora.
I'd prefer to install an OS myself, but for a quick testing environment, downloading a ready to go virtual machine seems like a convenient idea.