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

[Rachel Greenham]

kernel upgrade appeared to go OK actually; on the *second* reboot after that, this appeared after login.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: initramfs-tools 0.130ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-21.22-generic 4.15.17
Uname: Linux 4.15.0-21-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Fri Apr 27 13:37:48 2018
ErrorMessage: installed initramfs-tools package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-02-20 (71 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180214)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: initramfs-tools
Title: package initramfs-tools 0.130ubuntu3 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)

[Rachel Greenham (rachel-strangenoises)]

belately thought of trying: running sudo update-initramfs -k all -c produced no errors for both currently installed kernels:

rachel@spitfire:~$ sudo update-initramfs -k all -c
update-initramfs: Generating /boot/initrd.img-4.15.0-21-generic
update-initramfs: Generating /boot/initrd.img-4.15.0-20-generic

FWIW...

[Launchpad Janitor (janitor)]

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