** Description changed:

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

Title:
  No way to debug grub.cfg generation

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