summary:
a). the way in the internet just a sugestion, I must to do it in my own hands, yes ! just do it!
b). it's easy to do it. don't use the method that other people tells you comepletely
c). make sure of making it as soon as possible, then the remaining time can used for more useful and important things
procedure:
1、磁盘分区： 计算机——管理——磁盘管理——选中E盘——右击压缩卷.
2、tools: ultraISO
a) 用ultraISO工具把下载下来的ubuntu iso文件制作成U盘安装文件（类似CD安装）,then restart the windows.
b) knock F2/Del button to enter into the BIOS UI, select u pan to install it.