【Linux】换源

apt-get，是一条linux命令，适用于deb包管理式的操作系统，主要用于自动从互联网的软件仓库中搜索、安装、升级、卸载软件或操作系统。有时由于网络问题，无法安装各种包，尤其是一些国外的包，就需要进行换源操作。

备份自己的源：

sudo cp /etc/apt/sources.list /etc/apt/sources.bak1

使用编辑器打开源文件

sudo vi /etc/apt/sources.list

替换为国内镜像源

以阿里云为例

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

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

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

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

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