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It's time to move to Linux - YouTube
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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
Manual installation is one thing, but by far the biggest reason is OEM preinstalls. 98% of the people never install any operating system themselves, the devices just come with one and that's the one that'll be used.
DELL sold Ubuntu models and they abandoned them I believe.
IIRC part of that issue was that the Windows version of the same computer was cheaper because of MS licensing. For Linux nerds at the time it made more sense to buy the Windows version and do what they had always done, reinstall with the Linux of their choice.
They still sell laptops, desktops, and servers with Ubuntu pre installed.