How to install vagrant and vagrant-managed-server plugin

1. Download latest vagrant deb package and install it:

   https://www.vagrantup.com/downloads.html

   dpkg -i vagrant_1.8.4_x86_64.deb 

2. Install dependencies:

   apt-get -qqy install ruby-dev make

3. Install the vagrant-managed-servers plugin

   vagrant plugin install vagrant-managed-servers