I believe the expected solution is to use the GRUB from the latest
Ubuntu installed on such a disk, and let that GRUB boot older releases.
I am also not 100% sure if dual-booting two revisions of GRUB on one
disk was ever a supported scenario anyhow (even on BIOS GRUB was
installed to the MBR). Additionally no other UEFI aware OS seems to do
what's proposed.
Setting this to "Opinion" as this is a fundamental change on how the
bootloader is installed, and should be proposed upstream instead.
** Changed in: grub2 (Ubuntu)
Status: Triaged => Opinion
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https://bugs.launchpad.net/bugs/1056101
Title:
grub-efi overwrites an existing grub*.efi file
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