(non-UEFI) package shim-signed 1.34.7+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1

[James Jones]

This cccurred when upgrading to 18.04 final beta.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: shim-signed 1.34.7+13-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-19.20-generic 4.15.17
Uname: Linux 4.15.0-19-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.9-0ubuntu6
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Tue Apr 24 13:48:57 2018
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
EFITables: Apr 24 13:53:28 faster-eeyore fwupd[2654]: disabling plugin because: failed to startup uefi: UEFI firmware updating not supported
ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2017-10-18 (187 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Beta amd64 (20171015)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: shim-signed
Title: package shim-signed 1.34.7+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2018-04-23 (0 days ago)

[Steve Langasek (vorlon)]

The error in your log is:

Setting up shim-signed (1.34.7+13-0ubuntu2) ...
Installing for x86_64-efi platform.
grub-install: error: cannot find EFI directory.
dpkg: error processing package shim-signed (--configure):
 installed shim-signed package post-installation script subprocess returned error exit status 1

Why do you have the shim-signed package installed? The error message shows you do not have an EFI system partition mounted at /boot/efi, and it appears your system is not in EFI mode.

[Launchpad Janitor (janitor)]

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