1/ To install Vagrant, you can visit official website and download Debian package. This method allows you to install latest available version of vagrant. To install vagrant from deb package just use command below:
$ sudo apt install ./vagrant_2.2.6_x86_64.deb
2/ To create and start new virtual machine from Vagrantfile
$ vagrant up
3/ To connect existing virtual machine by ssh
$ vagrant ssh
3/ To stop virtual machine from Vagrantfile
$ vagrant halt
4/ To delete existing virtual machine from Vagrantfile
$ vagrant destroy