回帖：#deb http://httpredir.debian.org/debian stretch main contrib non-free
#deb-src http://httpredir.debian.org/debian stretch main contrib non-free
#deb http://httpredir.debian.org/debian stretch-updates main contrib non-free
#deb-src http://httpredir.debian.org/debian stretch-updates main contrib non-free
#deb http://httpredir.debian.org/debian stretch-backports main contrib non-free
#deb-src http://httpredir.debian.org/debian stretch-backports main contrib non-free
#deb http://security.debian.org/ stretch/updates main contrib non-free
#deb-src http://security.debian.org/ stretch/updates main contrib non-free
#ok
#deb http://ftp.cn.debian.org/debian/ stretch main contrib non-free
#deb http://ftp.cn.debian.org/debian/ stretch-updates main contrib non-free
#deb http://security.debian.org/ stretch/updates main
#deb http://ftp.debian.org/debian stretch-backports main
#deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
#deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
#deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
#deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main universe restricted
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main universe restricted

# deb http://mirrors.ustc.edu.cn/debian stretch main contrib non-free
# deb http://mirrors.ustc.edu.cn/debian stretch-updates main contrib non-free
# deb http://mirrors.ustc.edu.cn/debian stretch-backports main contrib non-free
# deb http://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free
deb http://ftp.cn.debian.org/debian/ stretch main contrib non-free
deb http://ftp.cn.debian.org/debian/ stretch-updates main contrib non-free
deb http://security.debian.org/ stretch/updates main
deb http://ftp.debian.org/debian stretch-backports