[Bug 2026225] Re: failed kernel mapping specification

[Benjamin Drung]

** Tags removed: foundations-todo

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Title:
  failed kernel mapping specification

Status in curtin:
  Fix Released
Status in subiquity:
  Fix Released
Status in livecd-rootfs package in Ubuntu:
  Fix Released

Bug description:
  In testing the current desktop installer ISOs with a freshly build
  u-d-i snap, curthooks fails like follows:

   finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/installing-kernel: FAIL: installing kernel
   finish: cmd-install/stage-curthooks/builtin/cmd-curthooks: FAIL: curtin command curthooks
   Traceback (most recent call last):
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/main.py", line 202, in main
       ret = args.func(args)
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/curthooks.py", line 1918, in curthooks
       builtin_curthooks(cfg, target, state)
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/curthooks.py", line 1752, in builtin_curthooks
       install_kernel(cfg, target)
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/curthooks.py", line 375, in install_kernel
       config.merge_config(mapping, kernel_cfg.get('mapping', {}))
   AttributeError: 'NoneType' object has no attribute 'get'
   'NoneType' object has no attribute 'get'
   curtin: Installation failed with exception: Unexpected error while running command.
   Command: ['curtin', 'curthooks']
   Exit code: 3
   Reason: -

  happened as part of an autoinstall test, no override of the kernel
  value.

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