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Linux has nearly half of the desktop OS Linux market
(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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
As far as I know, ChromeOS is also GNU/Linux (It uses full glibc, includes gnu utils and bash), so not so much.
They mention this in the article.
In fact, they never say it’s not Linux. The summary would be more like: “ChromeOS should be counted among desktop Linux, because it has the same basis as any other GNU/Linux distribution, unlike Android. Here are the dumb reasons I think people would argue against this.”