Comment 3 for bug 147535

For me I have a similar problem. gutsy qemu won't successfully the gusty desktop i386 livecd (ubuntu-7.10-desktop-i386.iso). But I don't get an error displayed before it drops into busybox.

Commandline:
qemu -cdrom /media/Nano/ubuntu-7.10-desktop-i386.iso -m 512 -boot d

If it's any assistance, here is my casper.log from the vm.

+ PREREQ=
+ . /scripts/casper-functions
+ . /scripts/functions
+ prereqs
+ echo
+ exit 0
+ PREREQ=
+ . /scripts/casper-functions
+ . /scripts/functions
+ . /scripts/lupin-helpers
+ . /scripts/casper-helpers
+ [ Ubuntu = Ubuntu ]
+ MP_QUIET=-Q
+ [ ! -x /bin/fstype ]
+ iso_path=
+ cat /proc/cmdline
+ [ ]
Unable to find a medium containing a live filesystem