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