I found the cause.
This is not USB/CD boot loader issue,
but X server issue.
1. The problem can be reproduced in both CD boot and USB boot.
2. ID->ubuntu PASS->none does not work.
what happened?
1. USB/CD boots.
2. forks gnome.
3. X crashes.
4. fall back to login screen.
5. enter ID/PASS.
6. forks gnome.
7. X crashes......
Booting Ubuntu with xforcevesa works.
So, this is not boot loader issue, but X server issue.
--- Okajima, Jun. Tokyo, Japan.
http://www.chromium.jp/
Very quick USB boot Ubuntu.
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usb booted, but can not log in
https://bugs.launchpad.net/bugs/550740
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