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The title seems fine. It doesn't say that all GNU/Linux distros are dropping PPC support. When you don't spec it is an implied existential statement, so the fully explicit version would be "There Exist Some GNU/Linux Distros That (Will) Have Silently Drop(ped) PPC Support" (allowing for the tense ambiguity that comes from the desire for short headlines). Also, the author states that Ubuntu is an exception to the described trend since they dropped PPC support but not silently.