Linux ubuntu 切换阿里更新源

文章出处:https://www.cnblogs.com/lyon2014/p/4715379.html

如国内网络使用ubuntu 则会出现apt-get无法安装更新的问题，这时大家需要切换到一些国内第三方更新源。

1. 首先查看自己的ubuntu系统的codename，直接导致你更新的源是否对你的系统起效果，查看方法： lsb_release -a
   
   我的系统显示：Codename: bionic

2. 确认阿里源支持
   登陆以下网页：http://mirrors.aliyun.com/ubuntu/dists/
   该网页显示了阿里云支持的ubuntu系统下各个Codename版本，确保自己的Codename在该网页中存在（一般都会有的）

3. 备份系统源：
   cd /etc/apt
   sudo mv sources.list sources.list_bak

4. 添加新的源文件：sudo vi sources.list
   并添加以下内容：注意，每一行的trusty应该用第一步查看得到的Codename来代替
   deb http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
   deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
   deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
   deb http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
   deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
   deb-src http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
   deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
   deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
   deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
   deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe

5. 保存并且sudo apt-get update，更新成功