安装ros时报错ERROR: cannot download default sources list from: https://raw.githubusercontent.com/ros/rosd

执行命令 sudo rosdep init 时，报错以下 ERROR: cannot download default sources list from: https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list Website may be down.git   缘由

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