安装Ubuntu系统后软件以及系统更新时就算网速很快下载速度也会很慢的解决方法

想要提高下载速度（达到自己宽带应该有的速度）。

1、先打开 /etc/apt/sources.list文件，然后修改，不过不能直接修改，要在终端里面修改。

2、首先：cd /etc/apt/

3、然后：su

4、输入你系统的密码：

5、首先输入：ls -l sources.list，记录该文件的属性，以便等哈改回来

6、然后修改文件属性：chmod 777 sources.list

7、打开文件：vi sources.list

8、将以下东西复制到文件的末尾：

deb ftp://mirrors.ustc.edu.cn/linuxmint/ lisa main upstream import universe multiverse

deb ftp://mirrors.ustc.edu.cn/ubuntu/ oneiric main restricted universe multiverse

deb ftp://mirrors.ustc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse

deb ftp://mirrors.ustc.edu.cn/ubuntu/ oneiric-updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ oneiric main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ oneiric-updates main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu/ oneiric-security main restricted universe multiverse

deb http://archive.canonical.com/ubuntu/ oneiric partner

deb http://packages.medibuntu.org/ oneiric free non-free

deb http://archive.getdeb.net/ubuntu oneiric-getdeb apps

deb http://archive.getdeb.net/ubuntu oneiric-getdeb games

deb http://mirrors.163.com/ubuntu/ oneiric main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ oneiric-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ oneiric-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ oneiric-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ oneiric main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ oneiric-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ oneiric-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ oneiric-backports main restricted universe multiverse


deb http://archive.ubuntu.com/ubuntu/ oneiric main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ oneiric-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ oneiric-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ oneiric-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ oneiric main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ oneiric-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ oneiric-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ oneiric-backports main restricted universe multiverse

然后保存退出

9、改回文件属性：chmod 644 sources.list（这里的644是我的系统里先前的属性，自己的要根据自己的改）

10、现在基本上就可以达到自己的宽带速度了。