This appears to have been caused by the publication of a grub2 security
update on 12/15 without the corresponding grub2-signed package being
published at the same time.
We have had similar issues in the past with publication of grub2 and
grub2-signed to the -updates pockets; the proposed solution there won't
help for the security pocket, however, since those publications don't go
via -proposed.
Subscribing the security team for comment.
To fix your current problem, you should install the grub-efi-
amd64-signed package.
** Changed in: linux (Ubuntu)
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/1528345
Title:
grub or kernel update broke Secure Boot by putting grubx64.efi instead
of shimx64.efi in EFI boot order
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