I cannot get Ubuntu Desktop 20.04 to run as a VM on UnRaid 6.8.3.  Every time I create a new VM and load up the .iso, the CPU goes to 100% and the VM doesn't boot to desktop.   This also happens when you try to upgrade to Ubuntu Desktop 20.04 from 19.10.   When you upgrade you will get a blank screen on VNC and CPU will be 100%.    This only seems to affect Ubuntu Desktop as Ubuntu Server 20.04 loads up fine.