Public bug reported:
[Impact]
* Sometimes it is not obvious why initrdless boot is generated; when is
it attempted; and when it fails and boots with initrd.
* Improve UX by leaving breadcrumbs and emit messages about initrdless
boot, in more places
[Test Case]
* Boot system with initrdless boot (such as AWS nitro-based instance type,
i.e. c5.large)
* Upgrade to new grub package
* Reboot
* Observe the following:
1. Upon `sudo update-grub`, message is emitted that initrdless boot
will be attempted
2. Inspecting /boot/grub/grub.cfg, there are comments that initrdless
boot will be attempted
3. Inspecting console log, there are echo message from grub about
attempting initrdless boot.
* Install linux-generic kernel flavour; and remove aws kernel flavour, reboot.
* Observe in the console log
1. There should be message about attempting initrdless boot
2. kernel panic
3. message about initrdless boot failing and attempting to boot with initrd
[Regression Potential]
* This change adds a few more user visible message, without
translations. The actual behaviour that is happening is unchanged. This
simply better notifies users about what is happening, and can be
inspected interactively, statically, and from boot logs.
[Other Info]
* CPC requested these UX improvements, as there have been concerns that
users are failing to discover why initrdless boot is happening; or
failing; and how to effect it.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1901553
Title:
Improve documentation around initrdless boot
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