打开Ubuntu的终端,输入
sudo gedit /etc/apt/sources.list
删掉里边所有旧的内容，把新的源列表内容贴进去
再执行:
sudo apt-get update
就可以生效。
ubuntu镜像源列表参考
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