ubuntu Installation

Installing VirtualBox from Ubuntu repositories
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sudo apt update && sudo apt install virtualbox virtualbox-ext-pack -y
# Follow instruction

Installing VirtualBox from Oracle repositories
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wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian $(lsb_release -cs) contrib"

sudo apt update
sudo apt install virtualbox-6.1