Installed Ubuntu on an external Hard Drive

I have successfully installed Ubuntu 9.10 on my spare external hard drive. I tried to install Ubuntu 10.04 but after installation, running for about 5 minutes, it would crash and the screen would freeze and go black.

So how did I do it? First I booted into the live cd and found out where the external hard drive was located. I used gparted or something like that. Then I followed the install process as normal. When I got to the partition section I selected my external hard drive and when I got to the last screen I used the advanced section to install the boot loader on the external hard drive and not my computer (this will mess my computer bootup if I skipped this step which I did by mistake) I put screenshots to help people understand.