deb http://mirrors.163.com/ubuntu/ utopic main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ utopic-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ utopic-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ utopic-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ utopic-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ utopic main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ utopic-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ utopic-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ utopic-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ utopic-backports main restricted universe multiverse