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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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Just in case you are not a native English speaker, the correct way to write your title is, “Flatpak and Snap are not the future”
This is because the subject of the sentence, Flatpak and Snap, is plural. I have some students who get confused with this since the subject is made of two singular nouns.