安裝ros時報錯ERROR: cannot download default sources list from: https://raw.githubusercontent.com/ros/rosd

執行命令 sudo rosdep init 時，報錯以下 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   緣由

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