(non-UEFI, present before upgrade) 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

[Francisco Argenal]

this package wasn't be installed

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: shim-signed 1.34.9+13-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No existe el archivo o el directorio: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Wed May 23 00:06:46 2018
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
EFITables: may 23 00:34:15 famac-Inspiron-660s fwupd[1639]: 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: Upgraded to bionic on 2018-05-23 (0 days ago)

[Steve Langasek (vorlon)]

This is reported as an upgrade of the shim-signed package; you previously had shim-signed 1.33.1~17.10.1+13-0ubuntu2
 installed from Ubuntu 17.10, and are upgrading to version 1.34.9+13-0ubuntu2 in Ubuntu 18.04. But the errors in your report show that the system has no /boot/efi partition mounted, and efibootmgr does not detect this as a UEFI system. Why did you have the shim-signed package installed?

[Launchpad Janitor (janitor)]

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