If you want to install Ubuntu 9.10 in your flash drive then you can do it by using a simple to use software named LiLi USB Creator (Linux Live USB Creator). This software offers lot many other features related to installation of Linux dstributions like Ubuntu, Fedora, Debian, Puppy Linux and many more in a flash drive.
LiLi USB Creator let you install and boot linux from flash drive by creating the boot file in that drive as well. You can start the Linux from flash drive itself on your windows PC. Here are the features available in LiLi USB Creator:
Features of LiLi USB Creator
1. Create bootable Linux in USB Drive
2. Launch Linux directly on your Windows PC without any installation of the linux on your system
3. Automatically configure the hardware according to the OS
Download LiLi USB Creator [Size (2.5 MB)]