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Debian
 
and then 
Red Hat
. Software repositories are generally made available in the form of 
mirrors
, to which your server subscribes. Mirrors are available across a multitude of 
geographic areas, so, typically, your installation of Ubuntu Server would subscribe 
to the mirror closest to you. These mirrors are populated with software packages that 
you'll be able to install. Many packages depend on other packages, so various tools 
on the Linux platform exist to automatically handle these dependencies for you. Not 
all distributions of Linux feature package management and dependency resolution, 
but Ubuntu certainly does, benefiting from the groundwork already built by Debian.
Packages contained within these mirrors are constantly changing. Traditionally, an 
individual known as a