[Bug 1775743] Re: [regression] Cosmic daily images 20180606-11 install but boots only to grub prompt on EFI systems

[Łukasz Zemczak]

Looking at the change in livecd-rootfs it seems to be indeed not
related, as the modified code-path is only executed for ubuntu-cpc
projects.

Writing down some of our thoughts. Me and Jean-Baptiste sat down on the
issue just now and noticed a strange thing happening in the ESP. We had
3 installs: A) cosmic ubuntu-server (debian-installer), B) cosmic
ubuntu-server-live (subiquity) system  and C) bionic ubuntu. A) is
obviously broken, we get the grub2 prompt after booting. All cases but
A) work, but even for A) it's possible still to boot the system by
directly loading the config from the main partition.

We compared the ESP contents in A), B) and C). For B) the grub.cfg file
(along with the .efi binaries) is located in the EFI/ubuntu/ directory
on the efi partition. For C) there are 2 grub.cfg files present (and the
corresponding binaries), one in EFI/ubuntu/ and one in EFI/grub/. Both
of those systems boot. However, for A) the ESP only has the EFI/grub/
part. It looks like something that usually installed the required bits
to ubuntu/ has changed and now, possibly, this is causing grub not
proceeding with its boot process. Problem is we can't seem to see any
changes in any of the installer packages that could have touched these
parts.

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https://bugs.launchpad.net/bugs/1775743

Title:
  [regression] Cosmic daily images 20180606-11 install but boots only to
  grub prompt on EFI systems

Status in grub2 package in Ubuntu:
  In Progress
Status in livecd-rootfs package in Ubuntu:
  New
Status in ubuntu-meta package in Ubuntu:
  New

Bug description:
  Cosmic daily images install successfully but then never boot (stuck in
  grub). I've tried a couple of machines.

  Fails: 20180611
  Fails: 20180608
  Fails: 20180607
  Fails: 20180606
  Works: 20180530

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