/etc/apt/source.list

统一格式：

deb https://A/B/ C  main restricted universe multiverse

#deb-src https://A/B/ C  main restricted universe multiverse

deb https://A/B/ C-security  main restricted universe multiverse

#deb-src https://A/B/ C-security  main restricted universe multiverse

deb https://A/B/ C-updates  main restricted universe multiverse

#deb-src https://A/B/ C-updates  main restricted universe multiverse

deb https://A/B/ C-backports  main restricted universe multiverse

#deb-src https://A/B/ C-backports  main restricted universe multiverse

##not recommended

#deb https://A/B/ C-proposed  main restricted universe multiverse

#deb-src https://A/B/ C-proposed  main restricted universe multiverse

 

A：源名

清华源：mirrors.tuna.tsinghua.edu.cn

中科大源：mirrors.ustc.edu.cn

华为源：repo.huaweicloud.com

阿里源：mirrors.aliyun.com

 

B：架构

amd64/x86：ubuntu

arm64：ubuntu-ports

 

C：系统版本

ubuntu14.04：trusty

ubuntu16.04：xenial

ubuntu18.04：bionic

ubuntu20.04：focal