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

[Sebastien Bacher]

Thank you for the bug report, it's a bit of a side command but since we
don't use offline updates is there a case in practice where we do call
to it anf fail/get the grub menu described there? Or is it just an issue
in case someone try to manual call to offline updates?

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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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