# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ focal main restricted
deb-src http://archive.ubuntu.com/ubuntu focal main restricted #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ focal universe
deb http://mirrors.aliyun.com/ubuntu/ focal-updates universe
deb http://mirrors.aliyun.com/ubuntu/ focal multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse #Added by software-properties
deb http://archive.canonical.com/ubuntu focal partner
deb-src http://archive.canonical.com/ubuntu focal partner
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ focal-security universe
deb http://mirrors.aliyun.com/ubuntu/ focal-security multiverse