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在新安装了Ubuntu系统后，安装软件出现“Unable to locate package“错误，这时应考虑系统的源出现问题。下面是对系统源进行更新。

一、首先备份源列表：

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

二、打开源文件：

sudo gedit /etc/apt/sources.list

三、将sources.list中的内容替换成下面的内容（全部覆盖）：

deb http://old-releases.ubuntu.com/ubuntu/ natty main restricted universe multiverse 
deb http://old-releases.ubuntu.com/ubuntu/ natty-security main restricted universe multiverse 
deb http://old-releases.ubuntu.com/ubuntu/ natty-updates main restricted universe multiverse 
deb http://old-releases.ubuntu.com/ubuntu/ natty-proposed main restricted universe multiverse 
deb http://old-releases.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse 
deb-src http://old-releases.ubuntu.com/ubuntu/ natty main restricted universe multiverse 
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-security main restricted universe multiverse 
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-updates main restricted universe multiverse 
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-proposed main restricted universe multiverse 
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse 

四、重新加载源列表：

sudo apt-git update

End.