VirtualBox のバージョン確認 VirtualBox 起動 ファイル→アップデートを確認(H)... vagrant を起動 $ vagrant up ==> Provider 'virtualbox' not found. We'll automatically install it now... The installation process will start below. Human interaction may be required at some points. If you're uncomfortable with automatically installing this provider, you can safely Ctrl-C this process and install it manually. ==> Downloading Virtual