I think it's because grub-efi-amd64 is missing. Installing it in /target
at the end of installation (after remounting the efi partition) fixes
the problem.
** Changed in: grub2 (Ubuntu)
Status: In Progress => Triaged
** No longer affects: livecd-rootfs (Ubuntu)
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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
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