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When I started to investigate into tools which help to automate provision of virtual machines, I found packer and vagrant, both tools provided by Hashicorp.
Unattended installation is the possibility to install an operating system without human interaction. Principally it is the same for Windows and Linux: An "answer file" which describes the configuration is provided as an input for the installer. These "answer files" provide any kind of setup options including how to partition disks and what packages/features to install.