After a fresh install of Ubuntu 9.04, you might have a network interface virbr0 if you’ve selected to install a virtual machine emulator. During the CD install, selecting vm, it will install kvm and xen. It will create a network interface virbr0 or virbr1 to perform host networking.
Later, if you decide to install VMWare, VirtualBox or decide you really didn’t want a virtual machine server, you can remove the applications easily. Just do a (sudo):
apt-get purge kvm
apt-get purge libxen3
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