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Setting up our server
Now it's time to set up an installation of Ubuntu Server to use for the examples in 
this book. But before we can do that, we have to decide what to actually install it on. 
For the purposes of this book, there isn't a specific requirement in terms of hardware. 
You just need an Ubuntu Server installation of some sort, and it wouldn't hurt to set 
up multiple servers if you can—you don't need them all to be on the same device 
type. Having multiple servers will help you experiment with networking when 
we get to that point later on in the book. But for now, it's only a matter of utilizing 
whatever you have at your disposal to get an Ubuntu installation going.
In particular, the following list includes the most common devices you can consider 
for your Ubuntu Server installation:
•  Virtual machine
•  Physical server
•  Virtual private server
•  Spare desktop or laptop
•  Raspberry Pi
Let's take a look at each of these options in more detail.
Virtual machine
Most computers sold nowadays support