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Linux for a Turion X2
(sh.itjust.works)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I'd bet that arch is a good choice. It's really lightweight, and great for learning about the console, managing packages, etc.
Also, arch is way less intimidating than its reputation suggests; especially on a secondary PC, where you can just run off to your main PC to look at the arch wiki.
Other than that, I suppose something like AntiX would probably run not-terrible on it as well.
It's only light if you configure it to be. It can be as heavy or as light as you want it to be, but it's a good place to learn and experiment, as it's comparatively trivial to switch stuff around. Arch wiki is probably the best Linux resource out there.