[Bug 2004208] Please test proposed package

[Steve Langasek]

Hello dann, or anyone else affected,

Accepted shim-signed into focal-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/shim-signed/1.40.9
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: shim-signed (Ubuntu Bionic)
       Status: New => Fix Committed

** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/2004208

Title:
  arm64 package has hardcoded x64 references

Status in canonical-signing-jobs:
  Fix Released
Status in canonical-signing-jobs task00 series:
  Fix Released
Status in canonical-signing-jobs task01 series:
  Fix Released
Status in canonical-signing-jobs task02 series:
  Fix Released
Status in canonical-signing-jobs task03 series:
  Fix Released
Status in shim-signed package in Ubuntu:
  New
Status in shim-signed source package in Bionic:
  Fix Committed
Status in shim-signed source package in Focal:
  Fix Committed
Status in shim-signed source package in Jammy:
  Fix Committed
Status in shim-signed source package in Kinetic:
  Fix Committed

Bug description:
  [Impact] 
  I couldn't figure out why the alternative wasn't being updated to the new shim after I installed a kernel installed w/ a 2022 key. Turns out its because we hardcode shim*x64* in the kernel hook:

  ubuntu at ubuntu:~$ grep x64 /etc/kernel/postinst.d/zz-shim
  if update-alternatives --query shimx64.efi.signed | grep "Best: /usr/lib/shim/shimx64.efi.signed.previous" -q; then

  There also seems to be a number of residual x64 references in the postinst:
  ubuntu at ubuntu:~$ grep x64 /var/lib/dpkg/info/shim-signed.*
  /var/lib/dpkg/info/shim-signed.postinst:	for efi_arch in x64 aa64; do
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.latest 100
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.previous 50
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.latest 50
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.previous 100
  /var/lib/dpkg/info/shim-signed.postinst:	if update-alternatives --query shimx64.efi.signed | grep "Best: /usr/lib/shim/shimx64.efi.signed.previous" -q; then

  [Test plan]
  Install a kernel signed with 2022 key on arm64, make sure that shimaa64.efi.signed alternative points to latest

  [Where problems could occur]
  Added/changed code could potentially break stuff on amd64.

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