Overview for installing Ubuntu via network

Simple overview for installing Ubuntu via network.

• Ubuntu Server is the OS we will install in this guide.
• Note: this is just the big picture, other guides can instruct on setting up the various DHCP, DNS, TFTP, and HTTP servers.
• The main idea is to focus on the fact that once the detail work is done (and most local networks have these setup) there's basically only 3 major steps to net install nirvana.