We describe a linux-based operating system (OS): Debian install to a personal computer (PC). We examine all the steps necessary to a console type PC, and a full desktop type PC. You can modify a console type to various server, like file, web, dns, and etc. server. A desktop can be a minimum configuration to enable to add software as we go by, or a fully configured desktop with some popular software like office suites, web browser, file viewer, and etc. The benefit of successful installation is free, and fully supported modern OS installed to reasonably old, but discarded PCs due to the terminated Windows OS support. Installing OS to any PC can be a puzzle to be solved. It is similar to Operations Research problem solving: Goal is set, but there may exist some restrictions.