LinuxParty

vmbuilder es una herramienta (introducida en Ubuntu 8.10) que permite crear máquinas virtuales (con Ubuntu como sistema operativo) para múltiples técnicas de virtualización. Actualmente admite Xen, KVM, VMware Workstation 6, y VMware Server. Usted puede después copiar las máquinas virtuales a otro sistema (Xen, KVM, VMware Workstation 6, VMware Server) y ejecutarlos allí. vmbuilder is a tool (introduced on Ubuntu 8.10) that allows you to build virtual machines (with Ubuntu as the OS) for multiple virtualization techniques. Currently it supports Xen, KVM, VMware Workstation 6, and VMware Server. You can afterwards copy the virtual machines to another system (a Xen, KVM, VMware Workstation 6, or VMware Server host) and run them there.

https://www.howtoforge.com/creating-virtual-machines-for-xen-kvm-vmware-workstation-6-vmware-server-with-vmbuilder-on-ubuntu-8.10