deb http://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
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deb http://mirrors.aliyun.com/ubuntu bionic main restricted deb http://mirrors.aliyun.com/ubuntu bionic-updates main restricted deb http://mirrors.aliyun.com/ubuntu bionic universe deb http://mirrors.aliyun.com/ubuntu bionic-updates universe deb http://mirrors.aliyun.com/ubuntu bionic multiverse deb http://mirrors.aliyun.com/ubuntu bionic-updates multiverse deb http://mirrors.aliyun.com/ubuntu bionic-backports main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu bionic-security main restricted deb http://mirrors.aliyun.com/ubuntu bionic-security universe deb http://mirrors.aliyun.com/ubuntu bionic-security multiverse