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
-
-
-
-
#
The
primary
network
interfacea
-
-
-
-
-
broadcast 192
.168
.2
.255
-
-
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
