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Now more than ever, ChromeOS is Linux with Google’s desktop environment
(www.aboutchromebooks.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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Always has been. One does not "use Linux" they use an operating system built on top of Linux.
Chrome is not Linux, but Xfce also is not Linux. Gnome is not Linux. KDE is not Linux. Linux is Linux.
Originally, ChromeOS was the Chrome browser with just enough code to boot to and take care of other essential OS functions. Like, the system settings and browser settings were practically merged.
The author is alluding to more recent efforts to untangle and separate ChromeOS from the Chrome browser. I believe the goal is for the Chrome browser on ChromeOS to be essentially the same as other Linux browser builds.
So these days ChromeOS is structured more like other Linux distros, with a huge difference being how locked down it is.
[Insert GNU/Linux interjection copypasta]
[Drama arises between intergnulactic forces]
There is a common understanding of what a Linux Desktop look like.
Whether you run Gnome, KDE or XFCE, you can install the same software and when you open a terminal you can do more or less the same thing.
ChromeOS however have a completely different user space. A bit like Android, yes it uses the Linux kernel but it's not what people think about when they talk about a Linux Desktop.