Dustin Kirkland, one of the top leaders of the Ubuntu project, explained in a rather lengthy and comprehensive open letter to the community that Ubuntu is probably used by more than a billion people.
Following a report from Phoronix, which stated that Canonical probably failed its goal of having 200 million users by the end of 2015, Dustin gathered all the data that he could find and summed it up at the end. It turns out that a large part of the world is using Ubuntu, and there are probably a lot more people out there who use Ubuntu, voluntarily or not.
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