package grub-pc 2.02~beta2-36ubuntu3.18 failed to install/upgrade: subprocess installed post-installation script returned error exit status 10

[vince]

This occurs on upgrades and now the notification pops up on startup as well.
Lubuntu 16-04

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-pc 2.02~beta2-36ubuntu3.18
ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Thu Sep 6 09:13:55 2018
DuplicateSignature:
 package:grub-pc:2.02~beta2-36ubuntu3.18
 Setting up grub-pc (2.02~beta2-36ubuntu3.18) ...
 dpkg: error processing package grub-pc (--configure):
  subprocess installed post-installation script returned error exit status 10
ErrorMessage: subprocess installed post-installation script returned error exit status 10
InstallationDate: Installed on 2018-04-12 (152 days ago)
InstallationMedia: Lubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
ProcCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-30-generic root=UUID=26ae734a-8006-4a19-b0fa-ccaf777bdcfb ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.27
SourcePackage: grub2
Title: package grub-pc 2.02~beta2-36ubuntu3.18 failed to install/upgrade: subprocess installed post-installation script returned error exit status 10
UpgradeStatus: No upgrade log present (probably fresh install)