ubuntu下更新软件源

1.备份软件源列表文件

sudo cp /etc/apt/sources.list  /etc/apt/sources.list_backup

2.编辑软件源配置文件（几种方法任选一）

gedit /etc/apt/sources.list（gnome）

kate /etc/apt/sources.list（KDE环境）

mousepad /etc/apt/sources.list（X环境）

3.替换文件中所有内容，保存文件，网易的软件源

      deb http://mirrors.163.com/ubuntu/ intrepid main restricted universe multiverse
      deb http://mirrors.163.com/ubuntu/ intrepid-security main restricted universe multiverse
      deb http://mirrors.163.com/ubuntu/ intrepid-updates main restricted universe multiverse
      deb http://mirrors.163.com/ubuntu/ intrepid-proposed main restricted universe multiverse
      deb http://mirrors.163.com/ubuntu/ intrepid-backports main restricted universe multiverse
      deb-src http://mirrors.163.com/ubuntu/ intrepid main restricted universe multiverse
      deb-src http://mirrors.163.com/ubuntu/ intrepid-security main restricted universe multiverse
      deb-src http://mirrors.163.com/ubuntu/ intrepid-updates main restricted universe multiverse
      deb-src http://mirrors.163.com/ubuntu/ intrepid-proposed main restricted universe multiverse
      deb-src http://mirrors.163.com/ubuntu/ intrepid-backports main restricted universe multiverse
4.更新软件源

sudo apt-get update

5.还原备份

sudo cp /etc/apt/sources.list_backup  /etc/apt/sources.list