Ubuntu源
每个 Ubuntu 版本都有自己的一组四个官方存储库：
Main– Canonical 支持的自由开源软件security– Ubuntu 用于指安全性更新updates– 非安全性更新proposed-updates– 预更新,小 beta 版-----不建议启用backports– 后备更新,用来对某些老版本软件进行功能更新-----一般不启用Universe– 社区维护的自由开源软件Restricted– 设备的专有驱动程序multiverse– 受版权或法律问题限制的软件，同 Debian 的non-free,非自由软件,也就是商业软件。
参考:
https://www.cnblogs.com/pengdonglin137/p/3342654.html
使用配置生成器
科大源配置生成器
https://mirrors.ustc.edu.cn/repogen/
安装依赖包
# 如果访问https源需要apt-transport-https支持
apt install apt-transport-https -y
打开apt源配置文件
vim /etc/apt/sources.list
国内apt源
参考: https://mirrors.ustc.edu.cn/help/ubuntu.html
如要用于其他版本，把 focal 换成其他版本代号即可:
22.04：jammy；20.04：focal；18.04：bionic；16.04：xenial；14.04：trusty。
中科大源
## 中科大源
# main
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
# security安全更新
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# updates非安全更新
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# proposed预更新,小 beta 版-----不建议启用
#deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
# backports后备更新,用来对某些老版本软件进行功能更新-----一般不启用
#deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# universe社区维护的自由软件--https国内访问不了
deb http://archive.ubuntu.com/ubuntu/ trusty main universe restricted multiverse
阿里源
# main
deb https://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
# security安全更新
deb https://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
# updates非安全更新
deb https://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
# proposed预更新,小 beta 版-----不建议启用
#deb https://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
#deb-src https://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
# backports后备更新,用来对某些老版本软件进行功能更新-----一般不启用
#deb https://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
#deb-src https://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
# universe社区维护的自由软件--https国内访问不了
deb http://archive.ubuntu.com/ubuntu/ trusty main universe restricted multiverse