Public bug reported:

This happened on a near-fresh install of 18.04 on a new computer.  I was
having trouble getting the NVIDIA proprietary drivers working.  So I did
quite a bit of install/uninstall cycles, failing to get the NVIDIA
drivers working.  I couldn't seem to get the NVIDIA drivers to work.

I just recently discovered the reason -- I had the UEFI secure boot
setup. So I disabled UEFI using the mokutil --disable-validation
command.  This crash occured on a system reboot.  I imagine I can fix my
setup from here.  I'll update the thread, regardless of the outcome.

I think perhaps Ubuntu would benefit from a warning, during the
installation process that UEFI secure boot can cause problems such as
this.  Also, when installing NVIDIA drivers with the "Software and
Updates" GUI, there should be some indication of the problems if the
UEFI secure boot is enabled.  Perhaps users should be blocked from
attempting the install, and pointed towards mokutil.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: initramfs-tools 0.130ubuntu3.5
ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Mon Nov 19 20:24:14 2018
ErrorMessage: installed initramfs-tools package post-installation script 
subprocess returned error exit status 1
InstallationDate: Installed on 2018-11-16 (3 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
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: initramfs-tools
Title: package initramfs-tools 0.130ubuntu3.5 failed to install/upgrade: 
installed initramfs-tools package post-installation script subprocess returned 
error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package bionic

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https://bugs.launchpad.net/bugs/1804130

Title:
  package initramfs-tools 0.130ubuntu3.5 failed to install/upgrade:
  installed initramfs-tools package post-installation script subprocess
  returned error exit status 1

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