(non-UEFI) package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1

The error in your log is:

Setting up shim-signed (1.34.9+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 is /boot/efi not mounted on your system?

During installation /boot/efi & grub could not be installed.
I've tried to install grub later but it failed again & again.

On Thu, May 17, 2018 at 10:10 AM Steve Langasek <
<email address hidden>> wrote:

> The error in your log is:
>
> Setting up shim-signed (1.34.9+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 is /boot/efi not mounted on your system?
>
> ** Changed in: shim-signed (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1771725
>
> Title:
> package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade:
> installed shim-signed package post-installation script subprocess
> returned error exit status 1
>
> Status in shim-signed package in Ubuntu:
> Incomplete
>
> Bug description:
> During Installation this Problem started.
> Still could not be solved.
>
> I have Ubuntu 16 installed.
> While trying to install Ubuntu 18.04 stable i faced it.
>
> ProblemType: Package
> DistroRelease: Ubuntu 18.04
> Package: shim-signed 1.34.9+13-0ubuntu2
> ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
> Uname: Linux 4.15.0-20-generic x86_64
> .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or
> directory: '/proc/sys/kernel/moksbstate_disabled'
> ApportVersion: 2.20.9-0ubuntu7
> Architecture: amd64
> BootEFIContents:
> fw
> fwupx64.efi
> Date: Thu May 17 09:37:36 2018
> EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2:
> EFI variables are not supported on this system.
> EFITables: May 17 09:32:40 hp fwupd[2211]: 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
> 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 1.34.9+13-0ubuntu2 failed to install/upgrade:
> installed shim-signed package post-installation script subprocess returned
> error exit status 1
> UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1771725/+subscriptions
>

Status changed to 'Confirmed' because the bug affects multiple users.