NFSが原因でVirtualboxとDebianホスト/ゲストが失敗する

次のような放浪スクリプトがあります。

Vagrant.configure(2) do |config|
    config.vm.box = "puppetlabs/debian-8.2-64-puppet"

    config.vm.network "private_network", type: "dhcp"

  config.vm.provider "virtualbox" do |v|
    v.memory = 4096
    v.cpus = 1
  end

  config.vm.provision "shell", inline: <<-SHELL
    apt-get update && install nfs-common portmap
    apt-get install -y puppet 

    puppet module install puppetlabs/stdlib
  SHELL

  config.vm.provision "puppet" do |puppet|
    puppet.manifest_file = "default.pp"    
    puppet.manifests_path = ".vagrant/puppet"
    puppet.module_path = ".vagrant/puppet/modules"
  end

  config.vm.synced_folder "./", "/var/www", :nfs => true
end

NFSを有効にすると（デフォルトの共有フォルダが他のプログラムに問題を引き起こすため、NFSが必要です）、次のエラーが発生します。

==> default: Exporting NFS shared folders...
==> default: Preparing to edit /etc/exports. Administrator privileges will be required...
● nfs-kernel-server.service - LSB: Kernel NFS server support
   Loaded: loaded (/etc/init.d/nfs-kernel-server)
   Active: active (exited) since Mon 2016-07-25 14:13:11 CDT; 17h ago
==> default: Mounting NFS shared folders...
The following SSH command responded with a non-zero exit status.
Vagrant assumes that this means the command failed!

set -e
mkdir -p /var/www
mount -o vers=3,udp 172.28.128.1:/home/alex/Projects/chrome /var/www
if command -v /sbin/init && /sbin/init --version | grep upstart; then
  /sbin/initctl emit --no-wait vagrant-mounted MOUNTPOINT=/var/www
fi


Stdout from the command:



Stderr from the command:

stdin: is not a tty
mount.nfs: requested NFS version or transport protocol is not supported

私はIDEとCLIを介して自分と昇格した権限を持つ「sudo」ユーザーとしてこのスクリプトを実行しましたが、まだ同じ結果を得ました。

どんなアイデアがありますか？