In Proxmox, if you create an Ubuntu VM that uses DHCP and after installation, if you clone the VMs, each VM will wind up with the same DHCP address. Here is a script to fix this.
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if [ "$EUID" -ne 0 ]
then echo "Please run as root"
exit
fi
echo ----------- Update and Upgrade
apt update
apt upgrade -y
echo ----------- Installing agent
apt-get install -y qemu-guest-agent
echo ----------- Restarting agent
systemctl start qemu-guest-agent
echo ----------- Wiping Cloud-init setup
apt purge -y cloud-init
rm -rf /etc/cloud
rm -rf /var/lib/cloud
echo ----------- Reinstalling Cloud-Init
apt install -y cloud-init
echo ----------- Fixing DHCP
rm /etc/machine-id
rm /var/lib/dbus/machine-id
touch /etc/machine-id
ln -s /etc/machine-id /var/lib/dbus/machine-id
echo ----------- Done!
A reboot or a poweroff will be required.