First of all, check that you have virtualization extensions enabled in BIOS settings. The vagrant up command that will be run later on will fail if you don't have virtualization extensions enabled.
Providing shell commands for Ubuntu for convenience but these instructions can be applied for other distributions as well.
First install VirtualBox.
$ apt-get install virtualbox
Download and install Vagrant for your operating system. You can get Vagrant from https://www.vagrantup.com/downloads.html
$ wget https://dl.bintray.com/mitchellh/vagrant/vagrant_1.7.2_x86_64.deb
$ sudo dpkg -i vagrant_1.7.2_x86_64.deb
If your internet access on your company's network is behind proxy, please follow the instructions to install and configure vagrant-proxyconf at: https://github.com/tmatilai/vagrant-proxyconf#quick-start
Clone this repository somewhere:
$ git clone https://github.com/Open-TEE/opentee-vagrant.git
Then provision the virtual machine by running vagrant up in opentee-vagrant directory.
$ cd opentee-vagrant
$ vagrant up
Now you should have your Vagrant environment set up. The open-tee directory is mapped to /home/vagrant/open-tee inside the virtual machine so you can use your favourite editor from outside the VM.
To log into the VM, run:
$ vagrant ssh
In case you get some error message about ubuntu/trusty64 box not being found, you can try to manually add Vagrant Box for Ubuntu.
$ vagrant box add ubuntu/trusty64 https://cloud-images.ubuntu.com/vagrant/trusty/current/trusty-server-cloudimg-amd64-vagrant-disk1.box