ubuntu 更新源报错

系统版本：ubuntu 14.10

报错信息：E: Some index files failed to download. They have been ignored, or old ones used instead

查看/etc/apt/sources.list

 http://us.archive.ubuntu.com/ubuntu/       #里面全是这个源地址

将全部的us.archive.ubuntu.com替换成old-releases.ubuntu.com

apt-get update

报错信息消失