ros 中ERROR: cannot download default sources list from: https://raw.githubusercontent.com/ros/rosdist
ERROR: cannot download default sources list from:https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.listWebsite may be down.最近做雷达相机的联合标定，然后不知怎么的把ros搞崩了，没办法只能重装，结果在 sudo rosdep init 的过程中就遇到了上面那个问题，这个问题不是第一次见，前几天实验室
