[Bug 1901596] [NEW] Could not calculate the upgrade, no reason given

[Algol Orion]

Public bug reported:

Updating from 18.04 LTS to 20.04 LTS, got an error message "could not
calculate the upgrade ". Originally the error message claimed that I
needed to purge PPA's from my system. I deleted all the "other software"
PPA's in the software and updates program, then tried to run the system
updater again.  This time it still failed to calculate the upgrade, but
did not give any reason whatsoever.  Because there was no reason, and it
said to file a bug report if "none of these reasons apply" I am filing a
bug report.  I apologize if this is insufficient information but I am
not a very experienced user.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.36
ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
Uname: Linux 4.15.0-122-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 26 14:58:51 2020
InstallationDate: Installed on 2018-05-16 (893 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-26 (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/1901596

Title:
  Could not calculate the upgrade, no reason given

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

Bug description:
  Updating from 18.04 LTS to 20.04 LTS, got an error message "could not
  calculate the upgrade ". Originally the error message claimed that I
  needed to purge PPA's from my system. I deleted all the "other
  software" PPA's in the software and updates program, then tried to run
  the system updater again.  This time it still failed to calculate the
  upgrade, but did not give any reason whatsoever.  Because there was no
  reason, and it said to file a bug report if "none of these reasons
  apply" I am filing a bug report.  I apologize if this is insufficient
  information but I am not a very experienced user.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.36
  ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
  Uname: Linux 4.15.0-122-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Oct 26 14:58:51 2020
  InstallationDate: Installed on 2018-05-16 (893 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-26 (0 days ago)
  VarLogDistupgradeTermlog:

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