Screenshot by Jack Wallen/ZDNETAs a longtime user of Linux, I’ve reached the point where I can practically install the operating system in my sleep. OK, not literally, because, well… that would be impossible. But you know what I mean.Shall I continue?I know many people who would love to try Linux but won’t because they either don’t have a spare computer or are afraid the installation will be too difficult. Allow me to allay those fears. First, a Linux installation doesn’t require a spare machine. Second, Linux (especially a distro like Ubuntu) has become so easy to install that just about anyone can do it.Also: I’m a Linux power user, and the latest Ubuntu update put a smile on my faceHowever, if you’re still unsure, I want to show you a way to test Ubuntu Desktop that is so easy that you’ll wonder why you didn’t try it before.Are you ready for this?It’s all about VirtualBox.What is VirtualBox?VirtualBox is an application that allows you to install “guest” operating systems on your “host.” The host is the operating system on which you’ve installed VirtualBox, and the guest OS is the operating system that is installed as a virtual machine. The guest does not interfere with the host, so even if something goes wrong with the guest, it won’t affect the host. More