[Bug 1912264] Re: Provide grub 2.04 EFI backport on bionic

[Dimitri John Ledkov]

grub2.04-signed in bionic must be compatible with grub-common as shipped
in bionic.

grub2-signed 1.142.10 in focal calls /usr/share/grub/grub-check-
signatures & /usr/lib/grub/grub-multi-install scripts, which are shipped
by grub-common in focal, and not available in bionic.

thus grub2.04-signed in bionic cannot use the same postinst as
grub2-signed in focal.

the origin of the grub2.04-signed is closer to shim-signed bionic
postinst, specifically the sanity checks and calling grub-install, for
both arm64 & amd64. But not doing any calls to update-secureboot-policy.

ps Looking closer at grub2-signed 1.142.10 in focal, it only provides a
postinst for amd64 and doesn't provide one for arm64 which is an
oversight.

** Changed in: grub2.04-signed (Ubuntu Bionic)
       Status: Incomplete => In Progress

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Title:
  Provide grub 2.04 EFI backport on bionic

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