SQL Server Latest Releases on Linux:
Before starting Virtual box installation it is benificial to download some other required tools during ubuntu installation. You can work directly in ubuntu plateform but there is another way to work by connecting through PuTTY. You can work with PuTTY untill you have openssh on your ubuntu server. You can install openssh directly from ubuntu or by downloading it and install form given path. Following is the image that is showing ubuntu and other downloaded files.
I choose virtual box to install ubuntu from my existing Windows. Next is step by step example for installing oracle virtual box.