sudo vim /etc/apt/sources.list
deb http://mirrors.aliyun.com/ubuntu/xenial main restricted
deb http://mirrors.aliyun.com/ubuntu/xenial-updates main restricted
deb http://mirrors.aliyun.com/ubuntu/xenial universe
deb http://mirrors.aliyun.com/ubuntu/xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/xenial-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/xenial-security main restricted
deb http://mirrors.aliyun.com/ubuntu/xenial-security universe
deb http://mirrors.aliyun.com/ubuntu/xenial-security multiverse
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