Not able to upgrade from 18.04 to 20.04.

[mysorepreetam]

not able to upgrade from 18.04 to 20.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.29 [origin: unknown]
ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
Uname: Linux 4.15.0-99-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
Date: Fri Jun 11 09:49:05 2021
InstallationDate: Installed on 2019-01-21 (871 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-06-11 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2021-06-11 09:47:08.750332
 Log time: 2021-06-11 09:48:11.515500
 Log time: 2021-06-11 09:49:04.763424
 Log time: 2021-06-11 09:49:07.569591