package grub-pc 2.02-2ubuntu8.9 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[yves GUILLON]

Original =installation not clean, under emergency activation with external disks.

Possible initiation of difficulties 6 month ago when passing from ubuntu 14.04 to 16.04 (either overflow of partition, or bad transition from graphic server (mixed things between Lubuntu; Xubuntu and Ubuntu.

Initial emergency solution from september , maybe with a 32bits systeme on secondary hard-drive, but activation of previous /home directory (probably 64bits).

Manual adjustment of grub.cfg in ordre to get access to xubuntu18.04 (from external amovible backup disk.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-pc 2.02-2ubuntu8.9
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Tue Dec 18 23:28:35 2018
ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-12-18 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
InvalidGrubScript: /etc/grub.d/39_custom (copie) /etc/grub.d/40_custom
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic root=UUID=0beca069-d781-439a-8538-c4fc07172aaa ro quiet splash
Python3Details: /usr/bin/python3.6, Python 3.6.7, python3-minimal, 3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.6
SourcePackage: grub2
Title: package grub-pc 2.02-2ubuntu8.9 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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