Overcome libvirt problem of Ubuntu guests having same IP after cloning

After cloning the Ubuntu guest, the clone will have the same IP.
To overcome this I found 3 ways:

1. On Ubuntu guest change /etc/machine-id and restart
2. Edit /etc/dhcpcd.conf and change from:

   duid

   to:

   clientid

   and reboot:

   reboot

3. Edit netplan config file, usually it is located at /etc/netplan/50-cloud-init.yaml and add dhcp-identifier: mac under network.ethernets.{{your_interface}} like this:

   network:
     version: 2
     ethernets:
       enp1s0:
         dhcp4: true
         dhcp-identifier: mac

   Apply the changes:

   netplan apply