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Although the idea behind Unity was sound, its execution fell flat. The release of GNOME 3 and Unity both represented drastic changes to the desktop metaphor, but of the two only GNOME 3 was a success. The ideas were similar, but GNOME 3 enjoyed more stability and more flexibility thanks to extensions. Ultimately, Ubuntu needs to scrap Unity and either migrate fully to GNOME 3, try something else, such as Enlightenment, or make Kubuntu or Xubuntu the default.