Public bug reported:
I got around the issue by uninstalling grub
https://stackoverflow.com/questions/53203528/errors-grub-efi-amd64-signed-shim-signed
```
# sudo apt-get purge grub\*
# sudo apt-get install grub-efi
# sudo apt-get autoremove
# sudo update-grub
```
ProblemType: Package
DistroRelease: Ubuntu 19.10
Package: grub-pc (not installed)
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
Date: Fri Oct 18 20:38:46 2019
DuplicateSignature:
package:grub-pc:(not installed)
Setting up grub-pc (2.04-1ubuntu12) ...
dpkg: error processing package grub-pc (--configure):
installed grub-pc package post-installation script subprocess returned error
exit status 20
ErrorMessage: installed grub-pc package post-installation script subprocess
returned error exit status 20
InstallationDate: Installed on 2019-06-12 (128 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-18-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
Python3Details: /usr/bin/python3.7, Python 3.7.5rc1, python3-minimal, 3.7.5-1
PythonDetails: /usr/bin/python2.7, Python 2.7.17rc1, python-minimal, 2.7.17-1
RelatedPackageVersions:
dpkg 1.19.7ubuntu2
apt 1.9.4
SourcePackage: grub2
Title: package grub-pc (not installed) failed to install/upgrade: installed
grub-pc package post-installation script subprocess returned error exit status
20
UpgradeStatus: Upgraded to eoan on 2019-10-19 (0 days ago)
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-package eoan
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https://bugs.launchpad.net/bugs/1848826
Title:
package grub-pc (not installed) failed to install/upgrade: installed
grub-pc package post-installation script subprocess returned error
exit status 20
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