[Bug 1882663] Re: Specify flavour ordering

[Julian Andres Klode]

bionic: ✓

- Install linux-image-lowlatency
- BEFORE: 4.15 generic sorts higher in menu than 4.4 lowlatency ✓
- Created /etc/default/grub.d/order.cfg with `GRUB_FLAVOUR_ORDER=lowlatency`
- AFTER: 4.4 lowlatency preferred over 4.15 generic ✓

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

Title:
  Specify flavour ordering

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Committed
Status in grub2 source package in Bionic:
  Fix Committed
Status in grub2 source package in Eoan:
  Won't Fix
Status in grub2 source package in Focal:
  Fix Committed
Status in grub2 source package in Groovy:
  Fix Released

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]
  Install two flavours, add flavour name with lower version to /etc/default/grub.d/somefilename

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