First of all, you need get installed VirtualBox and Vagrant
If you use Ubuntu 14.04 you can get both of them executing:
sudo apt-get install vagrant virtualbox
Otherwise, go to VirtualBox and Vagrant documentation
Get the VagrantFile from git repo:
git clone https://github.com/comperiosearch/vagrant-elk-box.git
And then go into created folder and install your elk vm.
cd vagrant-elk-box
vagrant up
Execution of vagrant up
take their time. Wait until you get the promt.
Then execute:
vagrant ssh
No credentials are need!