installation of release-upgrader fails

[Markku Karvinen]

installed grub-pc package post-installation script subprocess returned error exit status 127
installed friendly-recovery package post-installation script subprocess returned error exit status 127
installed linux-image-5.4.0-66-generic package post-installation script subprocess returned error exit status 1
installed linux-image-5.4.0-73-generic package post-installation script subprocess returned error exit status 1
installed linux-image-5.4.0-62-generic package post-installation script subprocess returned error exit status 1
installed linux-image-5.4.0-54-generic package post-installation script subprocess returned error exit status 1
installed linux-image-5.4.0-71-generic package post-installation script subprocess returned error exit status 1
installed linux-image-5.4.0-80-generic package post-installation script subprocess returned error exit status 1

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.35
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
NonfreeKernelModules: lkp_Ubuntu_5_4_0_52_57_generic_79 lkp_Ubuntu_5_4_0_52_57_generic_77 nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Aug 8 15:44:07 2021
InstallationDate: Installed on 2016-03-07 (1979 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fi_FI.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeTermlog: