package shim-signed 1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Lanre Smith]

The installation or removal of a software package failed.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
Uname: Linux 4.4.0-91-generic x86_64
.proc.sys.kernel.moksbstate_disabled: 0
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Fri Aug 18 07:48:42 2017
EFITables:
 Aug 18 07:27:17 francisca-Lenovo-G40-80 kernel: efi: EFI v2.40 by INSYDE Corp.
 Aug 18 07:27:17 francisca-Lenovo-G40-80 kernel: efi: SMBIOS=0x9c669000 ESRT=0x9c771418 ACPI 2.0=0x9cffe014
 Aug 18 07:27:17 francisca-Lenovo-G40-80 kernel: esrt: Reserving ESRT space from 0x000000009c771418 to 0x000000009c771450.
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-06-16 (427 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.24
SecureBoot: 6 0 0 0 0
SourcePackage: shim-signed
Title: package shim-signed 1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Steve Langasek (vorlon)]

Your upgrade log shows that you are on a UEFI system, but /boot/efi/EFI/ubuntu can't be found. Please attach /etc/fstab and show the output of 'ls -l /boot/efi'.

[Launchpad Janitor (janitor)]

[Expired for shim-signed (Ubuntu) because there has been no activity for 60 days.]