I had the same problem installing on an external drive. You may need
to boot from the LiveCD again and modify /boot/grub/list file as the
drives order has changed. Terrible bug in GRUB/ubuntu.

see my comments here

http://jguk.org/2008/01/kubuntu-710-japanese-environemnt.html

and the original problem here:

http://jguk.org/2007/11/ubuntu-killed-my-laptop.html

Cheers, Jon

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