[Bug 1812863] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for grub2 has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1812863

Title:
  No way to debug grub.cfg generation

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Bionic:
  Fix Committed
Status in grub2 source package in Cosmic:
  Fix Released

Bug description:
  [Impact]
  Any user who wants to understand how /boot/grub/grub.cfg is being generated. This is especially useful on dynamically-deployed systems (ie. using MAAS, cloud-init) on clouds or datacenter deployments.

  [Test case]
  1) Run 'update-grub'
  2) Verify that messages are displayed to describe which files are being read:

  $ sudo update-grub 
  Sourcing file `/etc/default/grub'
  Generating grub configuration file ...
  [...]

  
  [Regression potential]
  Watch out for any issues generating a correct and/or complete grub.cfg for next boot; missing kernels in the boot menu, or any missing kernel command-line parameters for a kernel booted after grub.cfg has been regenerated.

  ---

  It's really hard to debug what happens to generate grub.cfg -- no way
  to know what files (from /etc/default/grub, /etc/default/grub.d/*) are
  being used in which order.

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