[Bug 1725409] Re: (/boot/efi not mounted) package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[TPack]

I think /boot/efi is mounted on my system as shown by lsblk so I'm not
sure why I got this error.

$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 931.5G  0 disk 
├─sda1   8:1    0   128M  0 part 
├─sda2   8:2    0  1000M  0 part 
├─sda3   8:3    0   260M  0 part /boot/efi
├─sda4   8:4    0   500M  0 part 
├─sda5   8:5    0 418.4G  0 part /media/tom/Windows8_OS
├─sda6   8:6    0     2G  0 part [SWAP]
└─sda7   8:7    0 296.1G  0 part /
sdd      8:48   1   3.7G  0 disk 
└─sdd1   8:49   1   3.7G  0 part

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Title:
  (/boot/efi not mounted) package shim-signed
  1.32+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:
  Incomplete

Bug description:
  Received report immediately after upgrade from 17.04 to 17.10.

  ProblemType: Package
  DistroRelease: Ubuntu 17.10
  Package: shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  Date: Fri Oct 20 10:09:18 2017
  EFITables:
   Oct 20 10:30:57 tom-MS-7913 kernel: efi: EFI v2.31 by American Megatrends
   Oct 20 10:30:57 tom-MS-7913 kernel: efi:  ESRT=0x7e1fac98  ACPI=0x7d20c000  ACPI 2.0=0x7d20c000  SMBIOS=0x7e1faa98 
   Oct 20 10:30:57 tom-MS-7913 kernel: esrt: Reserving ESRT space from 0x000000007e1fac98 to 0x000000007e1facd0.
   Oct 20 10:30:57 tom-MS-7913 kernel: Secure boot could not be determined
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  GrubDiff: Binary files /boot/efi/EFI/ubuntu/grubx64.efi and /usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed differ
  InstallationDate: Installed on 2016-04-28 (539 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
  RelatedPackageVersions:
   dpkg 1.18.24ubuntu1
   apt  1.5
  SecureBoot: 6   0   0   0   0
  SourcePackage: shim-signed
  Title: package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to artful on 2017-10-20 (0 days ago)

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