This seems to be an issue with the devices firmware.
Please also be aware that only a single Ubuntu system can be installed
at a time with a working boot menu, as any other ubuntu entry is
replaced by the system that last updates grub.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1894242
Title:
grub-install: error: failed to register EFI boot entry???
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