1. Create a USB image to install Ubuntu to EeePC.
problem:
Got error: “Unknown keyword in configuration file”

How to fix:
This page is very helpful
http://alexsleat.co.uk/2010/11/27/how-to-fix-unknown-keyword-in-configuration-file-ubuntu-usb-boot/

2. choose partition
delete old /dev/sda7
then “Add” on “Free Space” -> new /dev/sda7
ext3
mount point -> /
Then install