Preseeding is a method for automating the installation of the Debian operating system and its derivatives.
Answers to installation questions, which would normally be answered interactively by an operator, are predetermined and supplied via a configuration file (and sometimes boot parameters).
This is similar to unattended installations of Windows operating systems using an answer file (see Installation (computer programs)).
Many Debian-based operating systems support preseed, because it is a feature of the Debian-Installer (also known as "d-i").
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