[출처] ubuntu 20.04에 버추얼 박스 설치|작성자 kjkim9612
위 블로그를 참고하여 실행하였다.
wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -\nwget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
echo "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian $(lsb_release -cs) contrib" | \
sudo tee -a /etc/apt/sources.list.d/virtualbox.list
sudo apt update
sudo apt install virtualbox-7.0
wget https://download.virtualbox.org/virtualbox/7.0.18/Oracle_VM_VirtualBox_Extension_Pack-7.0.18.vbox-extpack
sudo VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-7.0.18.vbox-extpack

# 비활성
sudo rmmod kvm_intel
sudo rmmod kvm
# 활성
sudo modprobe kvm
sudo modprobe kvm_intel