Install the cpu-checker to check if your system support virtualization.

sudo apt install -y cpu-checker

Run the command to see if the sys

kvm-ok

Install all the necessary packages.

sudo apt install -y qemu-kvm virt-manager libvirt-daemon-system virtinst libvirt-clients bridge-utils

You might also want to add the users that will be administering the KVM to the following group. If you are using root for administration then you can omit this step.

sudo adduser <username> kvm
sudo adduser <username> libvirtl