升级到 Ubuntu 7.10(Gutsy Gibbon)

升级过程也很简单，以前的系统是 Ubuntu 7.04，步骤如下：

1、首先 sudo sed -i 's/feisty/gutsy/' /etc/apt/sources.list

当然你可以打开 /etc/apt/sources.list，删除或注释掉所有内容。

加入下面几段（推荐使用 Ubuntu 官方源）：
deb http://archive.ubuntu.com/ubuntu/ gutsy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse

2、然后 sudo apt-get update

3、接着 sudo apt-get dist-upgrade

等待 2、3 个小时左右，更新完成。运气还比较好，整个过程中没有遇到一点麻烦。

升级完成后建议执行一下 sudo apt-get autoremove 和 sudo apt-get clean 释放空间。