ubuntu 14:04 : http: //mirrors.aliyun.com/ubuntu-releases/14.04/ ubuntu 16:04 : http: //mirrors.aliyun.com/ubuntu-releases/16.04/ ubuntu 18:04 : http: //mirrors.aliyun.com /ubuntu-releases/18.04/
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ubuntu 14:04 : http: //mirrors.aliyun.com/ubuntu-releases/14.04/ ubuntu 16:04 : http: //mirrors.aliyun.com/ubuntu-releases/16.04/ ubuntu 18:04 : http: //mirrors.aliyun.com /ubuntu-releases/18.04/
Ali mirror