il faut au préalable installer vagrant >= 2.2.4, mais aussi les plugins vagrant winrm et winrm-fs

wget -c https://releases.hashicorp.com/vagrant/2.2.6/vagrant_2.2.6_x86_64.deb
sudo dpkg -i vagrant_2.2.6_x86_64.deb

vagrant plugin install winrm
vagrant plugin install winrm-fs

Si vous avez les err

mkdir metasploitable
cd metasploitable
curl -O https://raw.githubusercontent.com/rapid7/metasploitable3/master/Vagrantfile
vagrant up