cannot upgrade in part due to kept back packages

[vamsi]

i tried upgrading to latest ubuntu by using update-manager -d but it says upgrade your current version and i tried upgrade but it says these packages have been kept back adobe-flash-properties-gtk adobe-flashplugin binutils binutils-common binutils-x86-64-linux-gnu boot-repair boot-sav boot-sav-extra
  distro-info-data file-roller gir1.2-javascriptcoregtk-4.0 gir1.2-json-1.0 gir1.2-webkit2-4.0 git git-man glade2script gnome-software
  gnome-software-common gnome-software-plugin-snap libasound2 libasound2-data libasound2-dev libbinutils libjavascriptcoregtk-4.0-18
  libjson-glib-1.0-0 libjson-glib-1.0-common libpython2.7 libpython2.7-dev libpython2.7-minimal libpython2.7-stdlib libpython3.6
  libpython3.6-dev libpython3.6-minimal libpython3.6-stdlib libwebkit2gtk-4.0-37 php7.2-bcmath php7.2-cgi php7.2-cli php7.2-common php7.2-curl
  php7.2-gd php7.2-imap php7.2-intl php7.2-json php7.2-mbstring php7.2-mysql php7.2-opcache php7.2-phpdbg php7.2-readline php7.2-xml php7.2-zip
  python2.7 python2.7-dev python2.7-minimal python3-update-manager python3.6 python3.6-dev python3.6-minimal thunderbird
  thunderbird-gnome-support thunderbird-locale-en thunderbird-locale-en-us ubuntu-software update-manager update-manager-core

i tries all online solutions but it did not work

my version now
Description: Ubuntu 18.04.4 LTS
Release: 18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 4.15.0-96.97-generic 4.15.18
Uname: Linux 4.15.0-96-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 27 02:15:15 2020
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to bionic on 2020-04-10 (16 days ago)
VarLogDistupgradeTermlog:

[Dave Jones (waveform)]

Duplicate of LP: #1874927 ?