Ubuntu 20.04系统默认官方源/腾讯云源/阿里云源/中科大源/清华源source.list

默认官方源source.list

deb http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

## Not recommended
# deb http://archive.ubuntu.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ focal-proposed main restricted universe multiverse

github上面的答案

deb http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

deb http://archive.canonical.com/ubuntu focal partner
deb-src http://archive.canonical.com/ubuntu focal partner

腾讯云内网source.list

deb http://mirrors.tencentyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.tencentyun.com/ubuntu/ focal main restricted universe multiverse

deb http://mirrors.tencentyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.tencentyun.com/ubuntu/ focal-security main restricted universe multiverse

deb http://mirrors.tencentyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.tencentyun.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://mirrors.tencentyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.tencentyun.com/ubuntu/ focal-backports main restricted universe multiverse

## Not recommended
# deb http://mirrors.tencentyun.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.tencentyun.com/ubuntu/ focal-proposed main restricted universe multiverse

阿里云内网source.list

deb http://mirrors.cloud.aliyuncs.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ focal main restricted universe multiverse

deb http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-security main restricted universe multiverse

deb http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-backports main restricted universe multiverse

## Not recommended
# deb http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ focal-proposed main restricted universe multiverse

中科大源source.list

deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse

## Not recommended
# deb https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse

清华源source.list

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse

## Not recommended
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse

腾讯云source.list

deb https://mirrors.cloud.tencent.com/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ focal main restricted universe multiverse

deb https://mirrors.cloud.tencent.com/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ focal-security main restricted universe multiverse

deb https://mirrors.cloud.tencent.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ focal-updates main restricted universe multiverse

deb https://mirrors.cloud.tencent.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ focal-backports main restricted universe multiverse

## Not recommended
# deb https://mirrors.cloud.tencent.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.cloud.tencent.com/ubuntu/ focal-proposed main restricted universe multiverse
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