deb https://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse