1. Open up a terminal and import the public key of the Oracle VirtualBox repository to your system.\\

<code>wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
</code>

2. Add the VirtualBox repository using the following command.\\
<code>
echo "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian bionic contrib" | sudo tee /etc/apt/sources.list.d/virtualbox.list
</code>

3. Update the repository index database.\\

<code>sudo apt-get update</code>

4, Install the VirtualBox using the apt command.\\

<code>sudo apt-get install -y virtualbox-6.0
</code>