昨天晚上更新源，居然报错了。
zcidcs@ubuntu:~$ sudo apt-get upgrade
[sudo] password for zcidcs:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
zcidcs@ubuntu:~$ sudo apt-get update
Err http://cn.archive.ubuntu.com trusty InRelease
Err http://security.ubuntu.com trusty-security InRelease
Err http://cn.archive.ubuntu.com trusty-updates InRelease
Err http://cn.archive.ubuntu.com trusty-backports InRelease
Err http://security.ubuntu.com trusty-security Release.gpg
Could not resolve 'security.ubuntu.com'
Err http://cn.archive.ubuntu.com trusty Release.gpg
Could not resolve 'cn.archive.ubuntu.com'
Err http://cn.archive.ubuntu.com trusty-updates Release.gpg
Could not resolve 'cn.archive.ubuntu.com'
Err http://cn.archive.ubuntu.com trusty-backports Release.gpg
Could not resolve 'cn.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/trusty-backports/InRelease
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/InRelease
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg Could not resolve 'cn.archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg Could not resolve 'security.ubuntu.com'
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg Could not resolve 'cn.archive.ubuntu.com'
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/trusty-backports/Release.gpg Could not resolve 'cn.archive.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
解决方案：
zcidcs@ubuntu:~$ sudo vi /etc/resolvconf/resolv.conf.d/base
添加这两行
nameserver 8.8.8.8
nameserver 8.8.4.4
然后
zcidcs@ubuntu:~$ sudo resolvconf -u
再查看下
zcidcs@ubuntu:~$ 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
最后执行
sudo apt-get update
如果还是错误，就要检查网络配置了。
/etc/network/interfaces
OK 解决
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