How do I find out which version and derivate of Ubuntu is right for my hardware in terms of minmal system requirements?

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http://askubuntu.com – For a given hardware configuration, how do I find out if Ubuntu will run on it? What considerations should I take into account when choosing an Ubuntu version and flavour such as: Xubuntu with a lighter desktop than the usual Gnome and Unity Lubuntu with the even lighter LXDE desktop Obviously Ubuntu does not run on some processor architectures. So how do I go about choosing the right version and derivate. How can I find out the minmal system requirements? (HowTos)