配置阿里云镜像源

deb http://mirrors.aliyun.com/ubuntu/ precise main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-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

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

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

root@iZ25q0jd99eZ:~# find / -name sources.list
/usr/share/doc/apt/examples/sources.list
/etc/apt/sources.list
/etc/apt/sources.backup.d/sources.list

直接复制上面的框内的代码，粘贴如‘# vi /etc/apt/sources.list’中然后：

# apt-get update