[Bug 1827532] Re: GRUB boot menu displays after running system-update.target

[Mario Limonciello]

With fwupd there are two ways that it will occur:

1. When updating a SuperIO EC device.  This device sets a flag that requires the update to perform offline due to undefined behavior with the keyboard controller.
2. Manually calling fwupdmgr with the --offline argument.  This will force any update to run in the systemd offline target.

I don't think it's a severe enough issue that needs SRU'ing, but if it's
just a symlink to solve it, I'd say fixing in the next development
release is sufficient.

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https://bugs.launchpad.net/bugs/1827532

Title:
  GRUB boot menu displays after running system-update.target

Status in grub2 package in Ubuntu:
  New

Bug description:
  As part of a discussion in upstream fwupd, we have been enabling
  support to call fwupd in an "offline" mode.  This means a clean system
  booted state.

  To accomplish this the systemd offline update functionality is used:
  https://www.freedesktop.org/software/systemd/man/systemd.offline-
  updates.html

  
  We discovered that on Ubuntu after the system-update.target is complete (success or fail) that the next boot we'll see the GRUB menu.

  I believe this is caused by the lack of running grub-initrd-
  fallback.service in the system-update.target.

  This should likely be fixable by symlinking it into
  /lib/systemd/system/system-update.target.wants to include it with
  system-update.target.

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