Install VirtualBox linuxmint 19

Open terminal :

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

Add repo to list

echo "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian bionic contrib" | sudo tee /etc/apt/sources.list.d/virtualbox.list

Update repo

sudo apt-get update

Install virtualbox

sudo apt-get install virtualbox-5.2 -y