Can't install 'ubuntu-desktop'

1) Description: Ubuntu 20.04.1 LTS
Release: 20.04

2) user@host:~$ apt-cache policy ubuntu-release-upgrader
N: Unable to locate package ubuntu-release-upgrader

3) Just trying to run Software Updater.

4)I had run into an issue with the public keys, which I fixed by running apt-key. Then I tried updating again and it said Not all updates can be installed so I ran a partial upgrade. But it returned this error message and suggested that I submit a bug report.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.27 [origin: unknown]
ProcVersionSignature: Ubuntu 5.4.0-49.53-generic 5.4.65
Uname: Linux 5.4.0-49-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 7 18:16:46 2020
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-01-09 (2098 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeTermlog: