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。
