I have KVM (Kernel-Based Virtual Machine) installed on my main system, which is currently running 9.04. I use it extensively for running various VMs (Virtual Machines): an Ubuntu database and web-server, some Windows-XP VMs, and for trying out new releases and new packages.

I recently downloaded both the 32 bit and 64 bit Desktop versions of Ubuntu 10.10, Neither of the live CDs will boot completely as a VM.

The CDs are both fine. I can boot a real physical PC with either disc.

Unfortunately, when I try to boot a VM using either version, they hang partway through the boot process (after the splash screen has been displayed, and them hidden again). It doesn't matter how long I wait; nothing happens. After a few minutes the optical disc drive goes idle, and there are no CPU cycles being used by the VM.

Does anyone have any idea why this is happening?