If you need to create lots of similar virtual machine guests running on QEMU/KVM, it is a very good idea to prepare a template guest image from which to clone the other guests. You should do whatever customizations you like before cloning. For instance I like to configure LVM and file systems to my liking, install openssh-server, install nfs-common and configure NFS mounts, install all available updates, add users or set up authentication, copy ssh keys, and do many other things so that they will be working out-of-the-box after cloning a number of guests from the template.
After you have installed and set-up your template virtual server to your liking, and would want to start cloning multiple instances of it, some tricks are needed to make things work more automatically after cloning and starting up the final copy.
If you simply clone a vanilla Ubuntu server installation multiple times, you will face some problems:
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