linux系统更换阿里源或者清华源（这里以Debian为例）

物理机一般都是默认不会改的，速度巨慢，需要修改这个，强烈建议清华源！

一、切换目录：

cd /etc/apt

二、备份一下默认的源

cp sources.list sources.list.backup

然后ls查看一下是否有备份了

三、编辑source.list配置文件

vi sources.list

或者使用winscp或finallshell进行直接编辑

修改为

1.阿里源：

deb http://mirrors.aliyun.com/debian/ bullseye main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ bullseye main non-free contrib
deb http://mirrors.aliyun.com/debian-security/ bullseye-security main
deb-src http://mirrors.aliyun.com/debian-security/ bullseye-security main
deb http://mirrors.aliyun.com/debian/ bullseye-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ bullseye-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ bullseye-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ bullseye-backports main non-free contrib

2.清华源：

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free

deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free

deb https://mirrors.tuna.tsinghua.edu.cn/debian-security bullseye-security main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security bullseye-security main contrib non-free

这里写的都是Debian系统的，如果你切换，请去其官方网站复制你对应系统的源

阿里巴巴开源镜像站：https://developer.aliyun.com/mirror/?utm_content=g_1000303593

清华大学开源镜像站：https://mirrors.tuna.tsinghua.edu.cn/help/debian/

四、运行命令生成缓存

apt-get clean - 删除所有已下载的包文件
apt-get update - 取回更新的软件包列表信息
apt-get upgrade - 进行一次升级

五、测试使用阿里云镜像源下载速度

apt install -d -y vim*

apt install -d -y xfce4 gnome libreoffice vlc

apt仅适用于Ubuntu和Debian，Centos需修改为yum

这里镜像源就切换完毕了，下载速度飞快