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Slackware wasn't the first Linux distro, but it's the oldest still alive and kicking
(www.theregister.com)
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 think I still have disks for Slackware 11 and 13 floating around somewhere. I even ran 13 for almost 2 years as a daily driver... And then got pissed off trying to update packages.
I'll admit that these days I just run Ubuntu, because it's easy, and it works without hours of googling how to fix some random dependency that I can't actually find for some reason.