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.
报错原因是 GitHub 的 raw.githubusercontent.com 无法连接，需要解决 GitHub 的 raw.githubusercontent.com 无法连接问题
通过 IPAddress.com 首页,输入 raw.githubusercontent.com 查询到真实IP地址
修改 hosts Ubuntu，
$ sudo code /etc/hosts
添加以下内容保存即可
199.232.28.133 raw.githubusercontent.com
在ubuntu更新时，出现错误E: Some index files failed to download, they have been ignored, or old ones used inst
在ubuntu更新时，出现错误E: Some index files failed to download, they have been ignored, or old ones used inst
http://www.ilovn.com/topic/ubuntu-update-error-esome-index-files-failed-to-download-they-have-been-ignored-or-old-ones-used-inst/
在ubuntu更新时，执行命令 sudo apt-get update，出现错误E: Some index files failed to download, they have been ignored, or old ones used instead
可以将目录下/var/lib/apt/lists/partial/所有的文件清掉
$ sudo rm /var/lib/apt/lists/* -vf
再次运行 apt-get update
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