How do you install and configure KVM on Ubuntu/CentOS?

Ubuntu Installation:

# Update system
sudo apt update

# Install KVM and related packages
sudo apt install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virt-manager

# Add user to libvirt group
sudo usermod -aG libvirt,kvm $USER

# Start and enable libvirt service
sudo systemctl start libvirtd
sudo systemctl enable libvirtd

CentOS/RHEL Installation:

# Install virtualization packages
sudo yum install qemu-kvm libvirt virt-install virt-manager

# Start and enable services
sudo systemctl start libvirtd
sudo systemctl enable libvirtd

# Add user to libvirt group
sudo usermod -aG libvirt $USER

Verification:

# Check KVM installation
sudo virt-host-validate
virsh list --all