curl -sSL http://acs-public-mirror.oss-cn-hangzhou.aliyuncs.com/docker-engine/internet | sh -

第二种方法

使用

vim /etc/apt/sources.list

然后
deb http://mirrors.cloud.aliyuncs.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.cloud.aliyuncs.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.cloud.aliyuncs.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.cloud.aliyuncs.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.cloud.aliyuncs.com/ubuntu/ trusty-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

第三种方式 wget ngrok

wget https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip

(注意看最后，是64位的)