Ubuntu cloud image for vagrant doesn't work with SMP

Vagrantfile

Vagrant::Config.run do |config|
  %w{20130425 20130429 20130502 20130506}.each do |date|
    config.vm.define "ubuntu-#{date}" do |vm|
      vm.vm.box = "ubuntu-#{date}"
      vm.vm.box_url = "http://cloud-images.ubuntu.com/vagrant/precise/#{date}/precise-server-cloudimg-amd64-vagrant-disk1.box"

      vm.vm.customize ["modifyvm", :id, "--cpus", 4]

      vm.vm.host_name = "ubuntu-#{date}"
    end
  end

  config.vm.define "ubuntu-vagrant" do |vm|
    vm.vm.box = "ubuntu-vagrant"
    vm.vm.box_url = "http://files.vagrantup.com/precise64.box"

    vm.vm.customize ["modifyvm", :id, "--cpus", 4]

    vm.vm.host_name = "ubuntu-vagrant"
  end
end

Fire this baby up with

vagrant up

And watch the output of

vagrant status | awk '$2 == "running" { print $1 }' | while read machine; do echo $machine `vagrant ssh $machine -c "grep processor /proc/cpuinfo | wc -l"`; done

It'll look something like:

ubuntu-20130425 1
ubuntu-20130429 1
ubuntu-20130502 1
ubuntu-20130506 1
ubuntu-vagrant 4

Funky, huh?