package grub-efi-amd64 2.02-2ubuntu8.12 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 255

I was adviced by the system to run: ”apt --fix-broken install”

Then I got an error message, and a request to submit the crash file to you.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64 2.02-2ubuntu8.12
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.1
AptOrdering:
 udev:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Tue Feb 12 10:29:17 2019
ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 255
InstallationDate: Installed on 2018-05-16 (271 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-24-generic root=UUID=6922f1bd-a4b7-40d8-bae4-a86df43116d8 ro quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /root/Error: command ['which', 'python'] failed with exit code 1:, Error: [Errno 2] Filen eller katalogen finns inte: "/root/Error: command ['which', 'python'] failed with exit code 1:": "/root/Error: command ['which', 'python'] failed with exit code 1:", unpackaged
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.1
SourcePackage: grub2
Title: package grub-efi-amd64 2.02-2ubuntu8.12 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 255
UpgradeStatus: No upgrade log present (probably fresh install)