[Bug 1908457] [NEW] unable to upgrade 18.04 to 20.04.1 u" An unresolvable problem occurred while calculating the upgrade."

[Stephen Gill]

Public bug reported:

After upgrade failed due to 3rd party sources I unticked/deselected
google, TeamViewer and graphics/ubuntu/bionic/main (sorry, not precise -
from my notes).  Then I power cycled the PC.

I'm running upgrade from limited user account and authenticating when
requested.

Do I need to install from downloaded image?

Full error message follows.


Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

 If none of this applies, then please report this bug using the command
'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to
investigate this yourself the log files in '/var/log/dist-upgrade' will
contain details about the upgrade. Specifically, look at 'main.log' and
'apt.log'.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 4.15.0-128.131-generic 4.15.18
Uname: Linux 4.15.0-128-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Dec 17 07:18:49 2020
InstallationDate: Installed on 2019-01-18 (698 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-16 (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/1908457

Title:
  unable to upgrade 18.04 to 20.04.1 u" An unresolvable problem occurred
  while calculating the upgrade."

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

Bug description:
  After upgrade failed due to 3rd party sources I unticked/deselected
  google, TeamViewer and graphics/ubuntu/bionic/main (sorry, not precise
  - from my notes).  Then I power cycled the PC.

  I'm running upgrade from limited user account and authenticating when
  requested.

  Do I need to install from downloaded image?

  Full error message follows.

  
  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   If none of this applies, then please report this bug using the
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
  you want to investigate this yourself the log files in '/var/log/dist-
  upgrade' will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41
  ProcVersionSignature: Ubuntu 4.15.0-128.131-generic 4.15.18
  Uname: Linux 4.15.0-128-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Dec 17 07:18:49 2020
  InstallationDate: Installed on 2019-01-18 (698 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-12-16 (0 days ago)
  VarLogDistupgradeTermlog:

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