Erro: vagrant up ansible: Aula 6, vídeo 2

$script_mysql = <<-SCRIPT
  apt-get update && \
  apt-get install -y mysql-server-5.7 && \
  mysql -e "create user 'phpuser'@'%' identified by 'pass';"
SCRIPT


Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/bionic64"

  config.vm.define "mysqldb" do |mysql|

    mysql.vm.network "public_network", ip: "192.168.0.17"

    mysql.vm.provision "shell",
      inline: "cat /configs/id_bionic.pub >> .ssh/authorized_keys"
    mysql.vm.provision "shell", inline: $script_mysql
    mysql.vm.provision "shell",
      inline: "cat /configs/mysqld.cnf > /etc/mysql/mysql.conf.d/mysqld.cnf"
    mysql.vm.provision "shell", inline: "service mysql restart"

    mysql.vm.synced_folder "./configs", "/configs"
    mysql.vm.synced_folder ".", "/vagrant", disabled: true
  end

  config.vm.define "phpweb" do |phpweb|
    phpweb.vm.network "forwarded_port", guest: 8888, host: 8888
    phpweb.vm.network "public_network", ip: "192.168.0.18"

    phpweb.vm.provision "shell",
      inline: "apt-get update && apt-get install -y puppet"

    phpweb.vm.provision "puppet" do |puppet|
      puppet.manifests_path = "./configs/manifests"
      puppet.manifest_file = "phpweb.pp"
    end
  end

  config.vm.define "mysqlsever" do |mysqlserver|
    mysqlserver.vm.network "public_network", ip: "192.168.1.22"
  end

  config.vm.define "ansible" do |ansible|
    ansible.vm.network "public_network", ip: "192.168.1.26"
    ansible.vm.provision "shell",
            inline: "apt-get update && \
                     apt-get install -y software-properties-common && \
                     apt-add-repository --yes --update ppa:ansible/ansible && \
                     apt-get install -y ansible"
  end
end

ao comandar vagrant up ansible, é apresentada a seguinte mensagem: $ vagrant halt An action 'halt' was attempted on the machine 'ansible', but another process is already executing an action on the machine. Vagrant locks each machine for access by only one process at a time. Please wait until the other Vagrant process finishes modifying this machine, then try again.

If you believe this message is in error, please check the process listing for any "ruby" or "vagrant" processes and kill them. Then try again.