[Bug 1997779] Re: grub2-signed postinsts need to source debconf

[Julian Andres Klode]

For some reason the SRU tooling did not do the verification-needed bits
for any release, but I marked it verified for bionic. We do not actually
have support for this in bionic, so this doesn't do anything of course,
the bug is just listed in the changelog due to copying the package
verbatim.

So I just tested that it installed successfully and rebooted in
multipass.

** Tags added: verification-done-jammy

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https://bugs.launchpad.net/bugs/1997779

Title:
  grub2-signed postinsts need to source debconf

Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2-signed source package in Bionic:
  Fix Committed
Status in grub2-signed source package in Focal:
  Fix Committed
Status in grub2-signed source package in Jammy:
  Fix Committed
Status in grub2-signed source package in Kinetic:
  Fix Committed
Status in grub2-signed source package in Lunar:
  Fix Released

Bug description:
  [Impact]
  dpkg-reconfigure grub-efi-*-signed do nothing, as debconf is weird and sourcing the script inside grub-multi-install is not enough.

  This means the questions about which ESP(s) to use might not get
  asked.

  [Test plan]
  Run dpkg-reconfigure grub-efi-amd64-signed, ensure it shows debconf prompts.

  same for grub-efi-arm64-signed

  [Where problems could occur]
  I'm not sure where problems could occur from adding a single line to the top of postinst that sources debconf when all other packages have it too, hmm.

  But of course debconf is always a bit weird. Maybe questions get asked
  twice, I don't know.

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