Ubuntu20.04更换国内镜像源

1.打开终端

2.输入以下命令备份原来的源。

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

3.再输入以下命令打开sources.list配置文件更换源。

sudo vim/etc/apt/sources.list

配置内容如下

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

清华源

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security multiverse

4.再输入命令更新源

sudo apt-get update

5.最后输入命令更新一下软件即可

sudo apt-get upgrade