Edit: you may want to check out my updated post in this topic.

In one of my projects I needed to quickly install and/or reproduce virtual Ubuntu servers using QEMU+KVM. It’s nothing difficult but I decided to record the required steps here so I don’t have to remember it all the time. The overall process is the following:

• download an installation image, mount it and make a writable copy
• modify/replace isolinux.cfg and preseed files
• recreate ISO and test by booting from it

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