## rosdep init/rosdep update 错误（ERROR: cannot download default sources list from）

rosdep init/rosdep update 错误（ERROR: cannot download default sources list from）

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按照 ros/installation在ubuntu 16.04上安装ros kinetic，在执行以下命令时：

$ sudo rosdep init

出现以下错误：

// 
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.

试了许多方法不奏效，如参考： https://blog.csdn.net/u013468614/article/details/102917569

以下方法奏效

打开：

sudo gedit /etc/hosts

添加以下内容至末尾：

# GitHub Start
192.30.253.112 github.com
192.30.253.119 gist.github.com
151.101.100.133 assets-cdn.github.com
151.101.100.133 raw.githubusercontent.com
151.101.100.133 gist.githubusercontent.com
151.101.100.133 cloud.githubusercontent.com
151.101.100.133 camo.githubusercontent.com
151.101.100.133 avatars0.githubusercontent.com
151.101.100.133 avatars1.githubusercontent.com
151.101.100.133 avatars2.githubusercontent.com
151.101.100.133 avatars3.githubusercontent.com
151.101.100.133 avatars4.githubusercontent.com
151.101.100.133 avatars5.githubusercontent.com
151.101.100.133 avatars6.githubusercontent.com
151.101.100.133 avatars7.githubusercontent.com
151.101.100.133 avatars8.githubusercontent.com
# GitHub End

成功：

sudo rosdep init
Wrote /etc/ros/rosdep/sources.list.d/20-default.list
Recommended: please run

	rosdep update

rosdep update同样成功