ubuntu 换镜像源（下载由慢变快）

为了防止修改配置文件错误而导致系统恢复困难，最好先备份一份。

在终端执行如下指令：

sudo cp /etc/apt/sources.list /ect/apt/sources.list.bak

之后再用vi 打开配置文件(注意此时也需要管理员权限因为要对文件进行修改):

sudo vi /etc/apt/sources.list

将官方的源替换成sohu源：

将文件的内容替换成为

deb http://mirrors.sohu.com/ubuntu/ saucy main restricted universe multiverse

#deb-src http://mirrors.sohu.com/ubuntu/ saucy main restricted universe multiverse

deb http://mirrors.sohu.com/ubuntu/ saucy-updates main restricted universe multiverse

#deb-src http://mirrors.sohu.com/ubuntu/ saucy-updates main restricted universe multiverse

deb http://mirrors.sohu.com/ubuntu/ saucy-backports main restricted universe multiverse

#deb-src http://mirrors.sohu.com/ubuntu/ saucy-backports main restricted universe multiverse

deb http://mirrors.sohu.com/ubuntu/ saucy-security main restricted universe multiverse

#deb-src http://mirrors.sohu.com/ubuntu/ saucy-security main restricted universe multiverse

deb http://mirrors.sohu.com/ubuntu/ saucy-proposed main restricted universe multiverse

#deb-src http://mirrors.sohu.com/ubuntu/ saucy-proposed main restricted universe multiverse

deb http://extras.ubuntu.com/ubuntu saucy main

#deb-src http://extras.ubuntu.com/ubuntu saucy main

保存之后

再执行指令：

sudo apt-get update

大功告成嘿嘿