Check if kvm can run on the computer
$ sudo kvm-ok <enter>
If it returns lines as follows, then it will work
INFO: /dev/kvm exists
KVM acceleration can be used
Install qemu-kvm
Open a terminal window and enter the commands below.
$ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virt-viewer virt-manager
<enter>
$ sudo adduser
<user>
libvirt <enter>
where user is the user name on the Linux computer.
$ sudo adduser
<user>
kvm <enter>
where user is the user name on the Linux computer.
Check the status with:
$ sudo systemctl status libvirtd <enter>
$ sudo systemctl enable --now libvirtd <enter>
$ lsmod | grep -i kvm
<enter>
$ sudo systemctl status libvirtd <enter>
You can also import VirtualBox hard disk .vdi files.