I've got an Ubuntu 9.10 32-bit boot DVD that I would like to install Adobe Flash on. How do I do this?
also: I would like to know how to install programs like VLC and Avast! antivirus on a Linux boot disk if that's possible.
It sounds like you want to remaster the disk with customized software installed on it. There are several tools to do this, one of which is from Canonical themselves. Essentially, you're adding the desired software packages to the Live Disk for use in a Live Environment or installed.