how to install virtualbox in ubuntu
wget –q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add - #use codename of your linux version,for my case focal is codename for #ubuntu 20.04.1 sudo add-apt-repository "deb http://download.virtualbox.org/virtualbox/debian focal contrib" #you can check codename of your system using command below lsb_release -cs sudo apt update && sudo apt install virtualbox-6.1