运行sudo rosdep init出现ERROR: cannot download default sources list from:解决方案

在安装ROS时，初始化rosdep时，出现 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. 解决方案 在终端运行 sud

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