[Bug 1896386] [NEW] An unresolvable problem occurred while calculating the upgrade. 18.04 to 20.04

[Tugurlan]

Public bug reported:

I have removed ppas using ppa-purge and I'm running nouveau driver for
nivida.

I still get the error.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
Uname: Linux 5.7.1-050701-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
Date: Sun Sep 20 17:29:28 2020
InstallationDate: Installed on 2018-08-26 (756 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-20 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-08-22T23:06:48.773333

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


** Tags: amd64 apport-bug bionic dist-upgrade

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https://bugs.launchpad.net/bugs/1896386

Title:
  An unresolvable problem occurred while calculating the upgrade. 18.04
  to 20.04

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

Bug description:
  I have removed ppas using ppa-purge and I'm running nouveau driver for
  nivida.

  I still get the error.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  Uname: Linux 5.7.1-050701-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sun Sep 20 17:29:28 2020
  InstallationDate: Installed on 2018-08-26 (756 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-20 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-22T23:06:48.773333

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