u盘启动/安装ubuntu

step1:

install tool unetbootin ;

unetbootin allows for the installation of various Linux/BSD distributions to a partition or

USB drive,so it's no different from a standard install,only it doesn't need a CD.It can

create a dual-boot install,or replace the existing OS entirely;

$sudo apt-get install unetbootin

step2:

run unetbootin and configure it

you only do two operations.One is choose the system ISO path and the other is choose

your usb driver(/dev/sdb1-for example)

I have tested ubuntu8.10 and xubuntu8.04 ok!.

reference:http://www.svn8.com/linux/WL/20090612/6404.html