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

[Fred Palmer]

Not sure proposed fix is all of issue.

I boot 18.04 by default with UEFI and every test or experimental install in the past has  overwritten my /EFI/ubuntu.
But install of Cosmic did not overwrite my /EFI/ubuntu but created /EFI/grub. It has a correct /EFI/grub/grub.cfg, but my UEFI is set to default boot using /EFI/ubuntu.
But booting grub UEFI entry booted me into my default install.
Issue is similar to previous bug reports where a change to GRUB_DISTRIBUTOR= creates a new UEFI entry, but internally either efi_distributor or perhaps just the code that defines where to find grub is hard coded to /EFI/ubuntu/grub.cfg.
It needs to use grub.cfg in the ESP folder it creates. And kluge on Kubuntu should finally be fixed.

Older version, not sure what you have now.

./.pc/install_arm64_naming.patch/util/grub-install.c:	efi_distributor = "ubuntu";
./debian/patches/install_efi_ubuntu_flavours.patch:+	efi_distributor = "ubuntu";
./ChangeLog:	GRUB_DISTRIBUTOR on efibootmgr line.
./debian/default/grub:GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
./debian/postinst.in:        bootloader_id="$(config_item GRUB_DISTRIBUTOR | tr A-Z a-z | \
./debian/changelog:    - Adjust UEFI installation to cope with Kubuntu setting GRUB_DISTRIBUTOR

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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 grub-installer package in Ubuntu:
  Fix Released
Status in grub2 package in Ubuntu:
  Won't Fix
Status in grub2-signed package in Ubuntu:
  Won't Fix
Status in ubiquity package in Ubuntu:
  Fix Released

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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