I have a similar issue when I upgraded to Ubuntu 19.10. I was thinking it was a
Grub2 issue.
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1851031
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** Also affects: grub2-signed (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1645075
Title:
UEFI + Secureboot + guided full disk encryption -> new