一般我们在安装ubuntu之后，尤其是国外的服务器，我们建议安装国内镜像源。在这里，陌涛我也整理到目前国内主流且可用的ubuntu镜像源，如果我们有需要使用的可以选择替代。

第一、目前可选国内ubuntu源

清华大学镜像源

 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

阿里云镜像源 ubuntu 18.04(bionic) 其他版本

   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

腾讯云

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

第二、如何替换Ubuntu源镜像

这里我们可以通过下面办法替换源镜像。

1、备份已有源

    cp /etc/apt/sources.list /etc/apt/sources.list.bak

2、编辑源文件

 /etc/apt/sources.list

然后上上面我们选择的源替换即可。

3、更新系统

 apt update -y

更新Ubuntu系统，反馈到更新正常没有错误就说明正常替换到国内源镜像，如果有错误需要单独解决。