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/lib/live/debconfig/0020-hostname.templates is in live-debconfig 4.0~alpha31-1.

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The actual contents of the file can be viewed below.

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Template: live-debconfig/title
Type: title
Description: live-debconfig: System Configuration

Template: live-debconfig/hostname/hostname
Type: string
Default:
Description: live-debconfig: Hostname?
 What should be the hostname of the current system?
 .
 The default value is determined automatically:
 .
   1. string in the /etc/hostname file, if existing and non-empty.
   2. distributor's ID as in the /etc/os-release file, if existing and
      non-empty.
   3. distributor's ID as in the lsb_release(1) program, if installed and
      non-empty.
   4. progress if the /etc/progress_version file is existing.
   5. debian as a fallback.