Xen
Xen is a well-known open-source virtualization platform. It is in widespread use by researchers, hobbyists, developers, and others. Web hosting companies that offer virtual servers often use Xen. Generally, Xen installs on bare metal, like VMware. It can be installed on top of another operating system in a host/guest arrangement. However, in 2008, Ubuntu made a decision not to support Xen. Instead, the Ubuntu community has focused its efforts on KVM. This is not a value statement that one is better than the other, but only that KVM seemed to be a better fit for the needs of an Ubuntu developer community that did not have the resources to give quality support to two similar virtualization platforms. It does appear possible to run Xen on Ubuntu, ...
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