//Uninstall just vagrant
//This will remove just the vagrant package itself.
sudo apt-get remove vagrant


//Uninstall vagrant and its dependencies
//To remove the vagrant package and any other dependant package which are no longer needed from Ubuntu.
sudo apt-get remove --auto-remove vagrant


//Purging vagrant (your config/data too)
//If you also want to delete your local/config files for vagrant then this will work.
sudo apt-get purge vagrant

//To delete configuration and/or data files of vagrant and it’s dependencies from Ubuntu then execute
sudo apt-get purge --auto-remove vagrant