【转】ubuntu apt-get update 失败解决

FROM : http://blog.csdn.net/ronghua_liu/article/details/8609450

当运行apt-get update后出现如下错误时：
E: Some index files failed to download, they have been ignored, or old ones used instead.

可以将目录下/var/lib/apt/lists/partial/所有的文件清掉，再次运行apt-get update即可！自带源在大陆不好。

出现以下错误：

/etc/apt$ sudo apt-get update
Err http://security.ubuntu.com precise-security InRelease

Err http://security.ubuntu.com precise-security Release.gpg
  Temporary failure resolving 'security.ubuntu.com'
Err http://cn.archive.ubuntu.com precise InRelease

Err http://cn.archive.ubuntu.com precise-updates InRelease

Err http://cn.archive.ubuntu.com precise-backports InRelease

Err http://cn.archive.ubuntu.com precise Release.gpg
  Temporary failure resolving 'cn.archive.ubuntu.com'
Err http://cn.archive.ubuntu.com precise-updates Release.gpg
  Temporary failure resolving 'cn.archive.ubuntu.com'
Err http://cn.archive.ubuntu.com precise-backports Release.gpg
  Temporary failure resolving 'cn.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise/InRelease

W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease

W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-backports/InRelease

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/InRelease

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/Release.gpg  Temporary failure resolving 'security.ubuntu.com'

W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'

W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'

W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/precise-backports/Release.gpg  Temporary failure resolving 'cn.archive.ubuntu.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.
xinju@xinjuOffice:/etc/apt$ cd ../network

阿里源:

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

修改ip:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interfacea
auto eth0
iface eth0 inet static
address 192.168.2.170
netmask 255.255.255.0
broadcast 192.168.2.255
gateway 192.168.2.1
dns-nameservers 192.168.2.1

修改dns:

1,重启生效：

sudo vi /etc/resolvconf/resolv.conf.d/base（这个文件默认是空的）

在里面插入：
nameserver 8.8.8.8
nameserver 8.8.4.4

如果有多个DNS就一行一个

修改好保存，然后执行

sudo resolvconf -u

再看/etc/resolv.conf，最下面就多了2行：

cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 8.8.8.8
nameserver 8.8.4.4

可以看到我们的设置已经加上了，然后再ping一个域名，当时就可以解析了，无需重启。

2，重启失效：

配置文件地址 /etc/resolv.conf

使用编辑器打开

改为如下内容：
search localdomain
nameserver 202.96.128.86 希望修改成的DNS
nameserver 202.96.128.166 备用DNS

重启网络：sudo /etc/init.d/networking restart。即可