Upgrading to the newest version throws an error. Even after resetting my sources.list file to default.

[Brysen Jacobsen]

I tried to upgrade to the newest version because when I boot up, the loading screen flashes at me the whole time and I read that I may just need to update, but when I do that it throws the error and says I need to go through ppa and purge entries, I did, all the way back to default and it still says something is wrong.
Release: 18.04.5 LTS

apt-cache policy pkgname returns "unable to find pkgname"

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 5.4.0-47.51~18.04.1-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 7 23:01:37 2020
InstallationDate: Installed on 2020-02-18 (203 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
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: Upgraded to bionic on 2020-09-08 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update-manager.release-upgrades: 2020-09-07T22:50:30.986661