package linux-image-4.4.0-186-generic 4.4.0-186.216 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1

[SUBINOY ADHIKARI]

system does not restart properly

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-186-generic 4.4.0-186.216
ProcVersionSignature: Ubuntu 4.4.0-184.214-generic 4.4.223
Uname: Linux 4.4.0-184-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.24
Architecture: amd64
Date: Wed Sep 2 06:24:13 2020
DpkgHistoryLog:
 Start-Date: 2020-09-02 06:22:22
 Commandline: /usr/bin/unattended-upgrade
 Install: linux-headers-4.4.0-189:amd64 (4.4.0-189.219, automatic), linux-headers-4.4.0-189-generic:amd64 (4.4.0-189.219, automatic), linux-modules-extra-4.4.0-189-generic:amd64 (4.4.0-189.219, automatic), linux-modules-4.4.0-189-generic:amd64 (4.4.0-189.219, automatic), linux-image-4.4.0-189-generic:amd64 (4.4.0-189.219, automatic)
 Upgrade: linux-headers-generic:amd64 (4.4.0.187.193, 4.4.0.189.195), linux-libc-dev:amd64 (4.4.0-187.217, 4.4.0-189.219), linux-image-generic:amd64 (4.4.0.187.193, 4.4.0.189.195), linux-generic:amd64 (4.4.0.187.193, 4.4.0.189.195)
ErrorMessage: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.32ubuntu0.1
SourcePackage: initramfs-tools
Title: package linux-image-4.4.0-186-generic 4.4.0-186.216 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
UpgradeStatus: No upgrade log present (probably fresh install)