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German state moving 30,000 PCs to Linux and LibreOffice - The Document Foundation Blog
(blog.documentfoundation.org)
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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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I'm not sure it'll even save them money, at least initially. They're likely paying consultants to work out the best approach, they need to retrain staff, and they'd probably go with a distro like RedHat that has vendor support (plus have paid support for LibreOffice too)