[Bug 1684830] Re: On upgrade to 17.04 package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Tim Passingham]

On a laptop running xubuntu I upgraded from 16.10 to 17.04 a few days
ago with no problem, and the /boot/efi wasn't mounted there either, so
it's still a bit of a puzzle.

However, all is now well for my systems, so I'm happy to leave it.

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Title:
  On upgrade to 17.04 package shim-signed
  1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  On upgrade to 17.04 from 16.10 got this, and also on grub-efi-
  amd64-signed

  ProblemType: Package
  DistroRelease: Ubuntu 17.04
  Package: shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: 0
  .sys.firmware.efi.efivars.MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23: Error: [Errno 2] No such file or directory: '/sys/firmware/efi/efivars/MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23'
  .sys.firmware.efi.efivars.SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: 

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