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I used Ubuntu as early as 2006, the version was 6.10, and updated every half a year, till 11.10. I think I failed in using it. I need to change windows of different programs frequently, which is not easy to find them in the Unity, when the number of programs are more than ten. You might be right. The menus become larger and larger. However, I don't think it's good way to type. First, Ubuntu is available for many languages. Is the keyword efficient in other languages? Second, if I don't know which command is correct, could the HUD give me a suggestion? Third, I need WINE to use some Windows programs, I'm afraid this design would make WINE more unstable.
I think Ubuntu should leave a traditional area where its new design breaks out. A traditional menu on the bottom won't take too much space.