Attempted upgrade from 18.04 LTS to 20.04 LTS

[Mitch]

Attempted the automated upgrade from 18.04 to 20.04 and hit failure.

└──> $ lsb_release -rd
Description: Ubuntu 18.04.5 LTS
Release: 18.04

└──> $ sudo apt-cache policy pkgname
N: Unable to locate package pkgname

Gui popped up with upgrade to 20.04,exception thrown stating to remove snap. No snap found with issues that I see.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
Date: Sun Oct 4 20:10:46 2020
InstallationDate: Installed on 2019-01-31 (612 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
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 2020-10-05 (0 days ago)
VarLogDistupgradeTermlog:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mitch (buildanddestroy)]

Output from terminal:

└──> $ sudo do-release-upgrade -d -f DistUpgradeViewGtk3
[sudo] password for REDACTED:
Sorry, try again.
[sudo] password for REDACTED:
Checking for a new Ubuntu release
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, Gdk
/usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewerWebkit.py:33: PyGIWarning: WebKit2 was imported without specifying a version first. Use gi.require_version('WebKit2', '4.0') before import to ensure that the right version gets loaded.
  from gi.repository import WebKit2 as WebKit
Gtk-Message: 14:41:03.261: GtkDialog mapped without a transient parent. This is discouraged.
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg'
extracting 'focal.tar.gz'