Ubuntu 22.04更换国内源
安装apt-get install sudo
1.备份原sources.list文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
需要恢复时，使用以下命令恢复原文件：
sudo cp /etc/apt/sources.list.bak /etc/apt/sources.list
2、添加国内源
在sources.list文件中添加国内源
2.1 Debian 11 源
① 中科大源
deb https://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free
#deb-src https://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free
#deb-src https://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free
#deb-src https://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free
deb https://mirrors.ustc.edu.cn/debian-security/ bullseye-security main contrib non-free
#deb-src https://mirrors.ustc.edu.cn/debian-security/ bullseye-security main contrib non-free
② 清华大学源
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
2.2 Ubuntu 22.04源
① 中科大源
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy main restricted universe multiverse
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
② 清华大学源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
3、更新一下系统包
sudo apt-get update
4、更换Debian官方源的公钥
sudo apt-get install debian-archive-keyring
5、清除本地缓存
sudo apt-get clean
6、验证
sudo apt-get update