cd /var/lib/vz
wget http://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img
export VM_ID="9010"
qm create $VM_ID --memory 2048 --net0 virtio,bridge=vmbr0 --sockets 1 --cores 2 --vcpu 2 -hotplug network,disk,cpu,memory --agent 1 --name cloud-init-focal2 --ostype l26
qm importdisk $VM_ID focal-server-cloudimg-amd64.img local-lvm
qm set $VM_ID --scsihw virtio-scsi-pci --virtio0 local-lvm:vm-$VM_ID-disk-0
qm set $VM_ID --ide2 local-lvm:cloudinit
qm set $VM_ID --boot c --bootdisk virtio0
qm set $VM_ID --serial0 socket
qm template $VM_ID
rm focal-server-cloudimg-amd64.img
Add user / public key to the image in the Proxmox menu