设置升级网站
vi /etc/apt/sources.list

deb http://ubuntu.cn99.com/ubuntu/ edgy main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ edgy-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ edgy-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ edgy-proposed main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ edgy-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ edgy main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ edgy-security main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ edgy-updates main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ edgy-proposed main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ edgy-backports main restricted universe multiverse deb http://ubuntu.cn99.com/ubuntu-cn/ edgy main restricted universe multiverse

（注：国内服务器，设立在杭州）
用代理上网的话，
apt加上代理：vi /etc/apt/apt.conf

把文件中的”false”改为”http://yourproxyserver:port”。

升级

apt-get update

apt-get upgrade

升级内核
apt-get install linux-686

更新完后重启，发现grub里还有原来的i386的kernel在，自然不再需要了：

sudo vi /boot/grub/menu.lst

把里面386的normal和recovery项目都删除咯。

完工！！