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So, which should you choose? It really just depends on your use case. Each of 
the universal package types is good at some things but has downsides. For the 
purpose of servers, Snaps are superior considering that Flatpaks and AppImages 
typically target only desktop applications. Flatpaks and AppImages are also great 
technologies, but where they fall behind for our use case is that they don't support 
server (non-
Graphical User Interface
, or non-
GUI
) applications well. This means 
that these package types are best for installing applications you'd normally find 
on a desktop Ubuntu installation, such as music players, browsers, graphical text 
editors, and so on. Snap packages target 
both
 GUI and non-GUI apps. Since server 
installations normally don't contain a GUI at all, this makes our choice for us. It 
could be the case that Flatpaks and AppImages start supporting non-GUI apps better 
in the future, but for now, the choice of universal package format is simple.
As it stands today, though, the majority of the packages we'll be installing are going 
to be Debian packages, as Snap packages are a bit slow to catch on. They're making 
steady progress, but it remains to be seen how well the industry will embrace them. 
For now, it's probably best to evaluate Snap packages when they're available and to 
choose the most appropriate package type based on availability, security, version, 
and support.
With the differences between Snaps and Debian packages out of the way, let's work 
through some examples of how to actually manage the software on our server. We'll 
look at commands to search for available packages, and then we'll install them and 
remove them.