deb http://debian.ustc.edu.cn/ubuntu/ precise main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ precise-backports main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ precise-security main multiverse restricted universe deb http://debian.ustc.edu.cn/ubuntu/ precise-updates main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ precise main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ precise-backports main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ precise-security main multiverse restricted universe deb-src http://debian.ustc.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
IPv6-Only 地址
deb http://mirrors6.ustc.edu.cn/ubuntu/ precise main multiverse restricted universe deb http://mirrors6.ustc.edu.cn/ubuntu/ precise-backports main multiverse restricted universe deb http://mirrors6.ustc.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe deb http://mirrors6.ustc.edu.cn/ubuntu/ precise-security main multiverse restricted universe deb http://mirrors6.ustc.edu.cn/ubuntu/ precise-updates main multiverse restricted universe deb-src http://mirrors6.ustc.edu.cn/ubuntu/ precise main multiverse restricted universe deb-src http://mirrors6.ustc.edu.cn/ubuntu/ precise-backports main multiverse restricted universe deb-src http://mirrors6.ustc.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe deb-src http://mirrors6.ustc.edu.cn/ubuntu/ precise-security main multiverse restricted universe deb-src http://mirrors6.ustc.edu.cn/ubuntu/ precise-updates main multiverse restricted universe