[Bug 1882663] [NEW] Speicify flavour ordering

[Julian Andres Klode]

Public bug reported:

[Impact]
We need to be able to override the preferred kernel flavour, examples being:

- OEM metapackages need to set the kernel flavour to oem, and later to
generic (e.g. when transitioning from 6.0-1000-oem to 6.0-1-generic)

- FIPS kernels might cause a downgrade compared to an HWE kernel, but if
you enable FIPS and reboot, you want to be booting a FIPS kernel

[Regression potential]
The change affects the ordering of kernels inside grub, hence a regression could be that we end up with the wrong order of kernels.

[Test case]
TBD

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: In Progress

** Affects: grub2 (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: grub2 (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: grub2 (Ubuntu Eoan)
     Importance: Undecided
         Status: New

** Affects: grub2 (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: grub2 (Ubuntu Groovy)
     Importance: Undecided
         Status: In Progress

** Also affects: grub2 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: grub2 (Ubuntu Groovy)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1882663

Title:
  Speicify flavour ordering

Status in grub2 package in Ubuntu:
  In Progress
Status in grub2 source package in Xenial:
  New
Status in grub2 source package in Bionic:
  New
Status in grub2 source package in Eoan:
  New
Status in grub2 source package in Focal:
  New
Status in grub2 source package in Groovy:
  In Progress

Bug description:
  [Impact]
  We need to be able to override the preferred kernel flavour, examples being:

  - OEM metapackages need to set the kernel flavour to oem, and later to
  generic (e.g. when transitioning from 6.0-1000-oem to 6.0-1-generic)

  - FIPS kernels might cause a downgrade compared to an HWE kernel, but
  if you enable FIPS and reboot, you want to be booting a FIPS kernel

  [Regression potential]
  The change affects the ordering of kernels inside grub, hence a regression could be that we end up with the wrong order of kernels.

  [Test case]
  TBD

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