There are many versions of Linux. At the deepest level, there are a few fundamentally different Linuxes, and each of these may appear in one or more, sometimes many, different "distributions." So, most Linux distributions are based on either Debian, RedHat/Fedora, Gentoo, and a couple/few others. Off hand, I'm not sure how many different core systems one has to add together to reach 50%, or 80%, or whatever you like.
Ubuntu is based on Debian. Debian is part of the GNU project, and is in some ways the philosophically purest, or main distribution. Many, many people will hate that I said that and comment below, and I look forward to their different perspectives. Read the rest of this post... | Read the comments on this post... ...
Anytime
