ubuntu 14.04 apt-get update失败的解决办法

<>ubuntu 14.04 apt-get update失败解决方法

在ubuntu14.04版本（虚拟机）安装jdk之前，一般我们会执行以下命令从源下载更新到系统
sudo apt-get install update
但这时总会出现形似：”fetch http://……失败。。。“ 的错误

尝试过在ubuntu自带的”system setting“中修改为国内的源，但总是不成功。
偶尔在网上看到一些解决办法，并尝试过确实能够更新成功，后续通过apt-get安装/更新也不再报错，方法很简答：
先切换目录
cd /etc/apt/
然后备份ubuntu中记录源地址的文件：
sudo cp sources.list sources.list.bak
打开sources.list
sudo vim sources.list
将sources.list中的代码使用#注释 ，并将以下代码拷贝到sources.list ，wq!保存退出
deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe
multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-security main
restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/
trusty-updates main restricted universe multiverse deb
http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe
multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main
restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty
main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/
trusty-security main restricted universe multiverse deb-src
http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe
multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main
restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/
trusty-backports main restricted universe multiverse deb
http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe
multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted
universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main
restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/
trusty-backports main restricted universe multiverse deb-src
http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted
universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates
main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/
trusty-proposed main restricted universe multiverse deb-src
http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe
multiverse
至此结束

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