執行rosdep update出錯解決辦法

1、錯誤 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 2、解決 有多是沒有安裝證書庫所致，能夠嘗試以下命令：g

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