I learned the hard way that my Dell PowerEdge R910 with 48 cores and 256 gigs of ram doesn’t support VT-x… It runs Ubuntu Server 18.04 currently and I decided to put Virtual Box on it because that has the easiest work around to get virtualization going on an unsupported processor. Virtualization is enabled in the BIOS, I’m not an idiot.
To get those VMs going anyways I had to lie to the software using the following command and I used one of the following processors since you don’t need to tell it to be a Xeon for a basic Domain Controller or backup appliance. You may need to disable USB on the VM also.
VBoxManage modifyvm “<VM name>” –cpu-profile “Intel Xeon X5482 3.20GHz”
VBoxManage modifyvm “<VM name>” –cpu-profile “Intel Core i5-3570”
VBoxManage modifyvm “<VM name>” –cpu-profile “Intel Core i7-2635QM”
VBoxManage modifyvm “<VM name>” –cpu-profile “Intel Core i7-3960X”
VBoxManage modifyvm “<VM name>” –cpu-profile “Intel Core i7-5600U”
VBoxManage modifyvm “<VM name>” –cpu-profile “Intel Core i7-6700K”