If you're on Ubuntu, perform:
-.. code-block:: console
+.. code-block:: shell
$ sudo apt-get install virtualbox
Here we are on a 64-bit version of CentOS, downloading and installing Vagrant 2.1.2:
-.. code-block:: console
+.. code-block:: shell
$ yum -y install https://releases.hashicorp.com/vagrant/2.1.2/vagrant_2.1.2_x86_64.rpm
This is a similar command, but on a 64-bit version of Debian:
-.. code-block:: console
+.. code-block:: shell
$ sudo apt-get install https://releases.hashicorp.com/vagrant/2.1.2/vagrant_2.1.2_x86_64.deb