Published at LXer:

This guide shows how you can install Ubuntu 8.10 on a USB flash drive. Ubuntu 8.10 comes with a tool that lets you create a USB startup disk easily - this startup disk behaves like the Ubuntu 8.10 Live-CD. This is useful if you want to install Ubuntu on a computer that has no CD/DVD drive. When you create the USB startup disk, you can also specify that you want your USB system to be persistent between boots (i.e., it does not lose your settings, documents, etc.) - that way you get a fully usable OS that you can carry around in your pocket.

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