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Upgrade to Linux
(www.upgradetolinux.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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Which makes Ubuntu basically Debian right? So just install that!
For a user coming from Windows I recommend Mint Cinnamon as it will give them the best, most familiar experience. Yes a newbie could find and install Ubuntu Cinnamon but the default ISO on the downloads page will saddle them with Gnome.