[Bug 1907007] [NEW] cannot calculate upgrade when trying to update form 18.04 to 20.04.1

[Justin Unverricht]

Public bug reported:

Cannot upgrade from 18.04 to 20.04. At first I was getting errors about
conflicting PPAs, once I removed those sources I get the same error
message saying that the upgrade cannot be calculated, but there is no
further information given. Doing dist upgrade and apt get -f does not
address the issue. Not sure how to proceed from here.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 4.15.0-126.129-generic 4.15.18
Uname: Linux 4.15.0-126-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec  6 15:02:00 2020
InstallationDate: Installed on 2017-12-16 (1085 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-06 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1907007

Title:
  cannot calculate upgrade when trying to update form 18.04 to 20.04.1

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Cannot upgrade from 18.04 to 20.04. At first I was getting errors
  about conflicting PPAs, once I removed those sources I get the same
  error message saying that the upgrade cannot be calculated, but there
  is no further information given. Doing dist upgrade and apt get -f
  does not address the issue. Not sure how to proceed from here.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41
  ProcVersionSignature: Ubuntu 4.15.0-126.129-generic 4.15.18
  Uname: Linux 4.15.0-126-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec  6 15:02:00 2020
  InstallationDate: Installed on 2017-12-16 (1085 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-12-06 (0 days ago)
  VarLogDistupgradeTermlog:

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