EFI variable creation failing was reasonably common firmware issue on
older EFI systems, there isn't much ubuntu can do to fix this for you
unfortunately.
You can try deleting existing boot entries and see if that helps, but
this isn't a bug in grub2 i'm afraid.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1871314
Title:
Could not prepare Boot variable: No space left on device
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