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There is a school in Wisconsin that uses Linux
(opensource.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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I went to an elementary school in California that was using Linux laptops circa ~2008, I have find memories of playing Super Tux after finishing my classwork.
Found your memories?
Anyway I too played SuperTuxKart. When I was in middle school I bought a computer for $3 at a garage sale and then shortly after installed Linux on it.