Ubuntu18.04..5 配置国内镜像源：解决E: Failed to fetch

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问题描述

使用 sudo apt get-install 出现 E: Failed to fetch问题。

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更换镜像源

错误原因：绝大多数情况下，ROS更新的下载源都是正常的，所以出现这个问题，应该是自己系统一些配置设置问题。

既然网络出现问题，我们更换下载源：

使用gedit或vi/vim打开配置文件:

sudo gedit /etc/apt/sources.list

或者

sudo vim /etc/apt/sources.list

替换里面全部内容

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

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