Linux更新完源以后无法更新的解决办法

• 执行更新数据(sudo apt-get update)提示:

  Err http://mirrors.aliyun.com trusty Release.gpg
    Could not resolve 'mirrors.aliyun.com'
  Err http://mirrors.aliyun.com trusty-updates Release.gpg
    Could not resolve 'mirrors.aliyun.com'
  Err http://mirrors.aliyun.com trusty-backports Release.gpg
    Could not resolve 'mirrors.aliyun.com'
  Err http://mirrors.aliyun.com trusty-security Release.gpg
    Could not resolve 'mirrors.aliyun.com'
  Reading package lists... Done
  W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/trusty/InRelease
  

  此时只要编辑网络DNS配置文件即可:

• 解决

  sudo gedit /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

  在弹出的文本里最下面加入:

  nameserver 8.8.8.8
  nameserver 8.8.4.4
  

  重启网络：

  sudo /etc/init.d/networking restart
  再次执行3步:

  sudo apt-get update
  执行完成,然后:

  sudo apt-get upgrade