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Why don't more distros use this method?
(www.virtualizationhowto.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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One of the great things about Linux is that if the user is still undecided after reading the paragraphs and looking at the screenshots, they can boot into the live environments and see for themselves which one is right for them.
You're expecting way too much of a new user. There's already 309534 distros to choose from, now you want them to boot into a dozen live environments of each one?