[Bug 2073594] Re: Autoinstall fails when using recovery_keyfile workflow

[James McKenzie]

** Attachment added: "Original user-data contents"
   https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2073594/+attachment/5798579/+files/user-data

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Title:
  Autoinstall fails when using recovery_keyfile workflow

Status in subiquity package in Ubuntu:
  New

Bug description:
  With the Ubuntu 24.04 Desktop ISO, and the latest stable ubuntu-
  desktop-bootstrap snap (0+git.9b015d0d6), autoinstall is failing when
  attempting to add a recovery key.

  I have attached the relevant installer logs and autoinstall user-data.
  I've inspected them myself and can see a python traceback which shows
  that _expose_key function in
  `subiquity/subiquity/models/filesystem.py` is failing when copying the
  recovery_key to the target system.

  The key itself appears to be undefined for some reason.

  I'm using /etc/machine-id as the recovery_keyfile for testing because
  it's a single-line string and world readable.

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