package initramfs-tools 0.136ubuntu6.4 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1

[Osian]

Hello
I'm trying to do apt-get upgrade and I get the following errors:
Setting up initramfs-tools (0.136ubuntu6.4) ...
update-initramfs: deferring update (trigger activated)
Setting up flash-kernel (3.103ubuntu1~20.04.1) ...
flash-kernel: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.136ubuntu6.4) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-70-generic
Unsupported platform.
run-parts: /etc/initramfs/post-update.d//flash-kernel exited with return code 1
dpkg: error processing package initramfs-tools (--configure):
 installed initramfs-tools package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 initramfs-tools

Version of Ubuntu:
Description: Ubuntu 20.04.2 LTS
Release: 20.04
version
Unable to locate package pkgname

Expected:
Successful upgrade

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: initramfs-tools 0.136ubuntu6.4
Uname: Linux 4.9.93-mainline-rev1 armv7l
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: armhf
CasperMD5CheckResult: skip
Date: Fri Apr 2 21:45:54 2021
ErrorMessage: installed initramfs-tools package post-installation script subprocess returned error exit status 1
PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.4
SourcePackage: initramfs-tools
Title: package initramfs-tools 0.136ubuntu6.4 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to focal on 2021-04-02 (0 days ago)