ubuntu apt-get update 失败解决

问题描述：

W: Failed to fetch http://mirrors.aliyun.com/debian/dists/wheezy/InRelease Temporary failure resolving 'mirrors.aliyun.com'
W: Failed to fetch http://mirrors.aliyun.com/debian/dists/wheezy-updates/InRelease Temporary failure resolving 'mirrors.aliyun.com'
W: Failed to fetch http://mirrors.aliyun.com/debian-security/dists/wheezy/updates/InRelease Temporary failure resolving 'mirrors.aliyun.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

修改 
/etc/resolv.conf 
追加 
nameserver 8.8.8.8

nameserver 8.8.4.4

nameserver 198.153.192.1

nameserver 198.153.194.1

nameserver 208.67.222.222

nameserver 208.67.220.220
重启网络 
sudo /etc/init.d/networking restart

但是下次开机以后/etc/resolv.conf 文件恢复初始值， sudo apt-get update 还是会出问题，找到解决办法：sudo vim /etc/network/interfaces 

添加： 

dns-nameserver 8.8.8.8

dns-nameserver 8.8.4.4

dns-nameserver 198.153.192.1

dns-nameserver 198.153.194.1

dns-nameserver 208.67.222.222

dns-nameserver 208.67.220.220

重启虚拟机 
sudo apt-get update 可以一直用了