I'm the author of multicd.sh (see my sig.) I've been trying to create a plugin that would let you have multiple versions of Ubuntu on one disc. In prior versions, this would require changing the initrd (which I have done with 9.04.) However, in karmic, it is changed to now use the live-media-path argument.The problem is that when I add live-media-path=ubuntu2 to the ISOLINUX command line and change the directory "casper" to "ubuntu2", it fails to boot.
I'm going to do a little more research on this, but in the meantime, does anyone have any idea why this occurs?