Ubuntu换源（本地）

作者 原文链接：https://blog.csdn.net/MacWx/article/details/137689898

查询系统版本

lsb_release -a

系统版本是 Ubuntu 20.04.6 LTS，注意这个开发代号Codename，Ubuntu每一个版本都有一个代号，这个一定要跟国内源对应，否则会出问题。

阿里云Ubuntu镜像：https://developer.aliyun.com/mirror/ubuntu

ubuntu 20.04 LTS (focal) 配置如下
我系统版本是20.04，所以可以从下面镜像信息中看到都是focal代号的。

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-backports main multiverse ress
tricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-proposed main multiverse restt
ricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-security main multiverse restt
ricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-updates main multiverse restrr
icted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ focal main multiverse restrictee
d universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-backports main multiversee
 restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-proposed main multiverse
restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-security main multiverse
restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ focal-updates main multiverse rr
estricted universe

弃用：

deb https://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

deb https://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

deb https://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

# deb https://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse

deb https://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

更换方法
1.备份

sudo cp /etc/apt/sources.list /etc/apt/sources.list.back

2.编辑

打开vim编辑器，把sources.list文件中所有的deb文件全部注释掉或者删除掉，然后把上面给的国内镜像复制去就可以。

vim /etc/apt/sources.list

3.更新软件源

sudo apt update
sudo apt upgrade

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原文链接：https://blog.csdn.net/MacWx/article/details/137689898