The download instructions indicate that neither cd is bootable. If you use the dual cd option, you boot off the kubuntu live cd to install kubuntu, adn then lmce on top of it. The quick install dvd is bootable, since it has both kubuntu and lmce on one disk and installs everything at once. The dvd is much easier to use (think 20 minute installation with 3 keystrokes, vs 2+ hours installation). And the dvd is pretty much bulletproof. *but* it's a 4gb download.