ros 中ERROR: cannot download default sources list from: https://raw.githubusercontent.com/ros/rosdist

ros 中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.ERROR: cannot download default sources list from:亲测能用，亲测能用解决办法第一步解决办法第二步解决办法第三步解决办法第四步（最后一步）
https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list
Website may be down.) ERROR: cannot download default sources list from:

sudo rosdep init
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.

亲测能用，亲测能用 ubuntu16.04已测 解决办法第一步

在桌面打开终端输入下面指令

sudo chmod 777 /etc

此指令为获取etc中的权限，操作成功后如下：每个图标右下角有一把锁

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作者：李德龙杰

com https ros FROM DEFAULT error list