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 multiversegithub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