[Bug 1652147] [NEW] UEFI secure boot fails after 14.04 to 16.04 upgrade

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I did a release upgrade from fully upgraded Trusty/14.04.x to Xenial/16.04 today (amd64). There was no indication of any problems during the upgrade. Only oddly asking to disable secure boot on the shim level again (already had done this on Trusty). Also I had the proposed pocket enabled in Trusty before doing the upgrade (update-manager).
After reboot I get a textual error message that "image verification has failed" and I am presented with a menu to select a different UEFI element (this is a Lenovo x230).
I can disable secure boot in the BIOS and am then able to boot.
Not sure this is related to the issue but from the system booted without secure boot I tried to run sbverify and it returns the same error for all EFI binaries I tried:

# sbverify shimx64.efi 
warning: data remaining[1170360 vs 1289424]: gaps between PE/COFF sections?
PKCS7 verification failed
140313718134424:error:21075075:PKCS7 routines:PKCS7_verify:certificate verify error:pk7_smime.c:336:Verify error:unable to get local issuer certificate
Signature verification failed

If there is any other info that is needed, let me know. Or/and if there
are any steps to resolve the issue, let me know, too.

** Affects: shim (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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UEFI secure boot fails after 14.04 to 16.04 upgrade
https://bugs.launchpad.net/bugs/1652147
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