1、备份原文件
cp /etc/apt/sources.list /etc/apt/sources.list.bak
2、清空 sources.list 文件中的内容，然后将以下任何一个源复制到文件中，以阿里源为例：
vim /etc/apt/sources.list deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse #保存退出 :wq
3、更新源
apt-get update
apt-get upgrade
4.1 阿里源
deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
4.2 清华源
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
4.3 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
4.4 网易163源
deb http://mirrors.163.com/ubuntu/ jammy main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ jammy-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ jammy-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ jammy-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ jammy-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ jammy main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ jammy-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ jammy-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ jammy-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ jammy-backports main restricted universe multiverse
5、可能出现的错误
Ubuntu 404 Not Found [IP: 91.189.95.85 80]
这个错误有可能是你的网络运营商拦截了，这个很坑。
我当初遇到这个问题后，尝试了网上的各种办法都没解决，我的宽带是联通的，最后切换到移动网络，顺利解决！
package has no installation candidate
这个错误就是你的源出问题了，尝试：apt-get update，如果不行就按上面的步骤切换一下源。