[Bug 1910510] Re: [do-release-upgrade] An unresolvable problem occurred while calculating the upgrade.

[Brian Murray]

*** This bug is a duplicate of bug 996916 ***
    https://bugs.launchpad.net/bugs/996916

** This bug has been marked a duplicate of bug 996916
   postgresql packages in the removal blacklist making it hard to upgrade

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https://bugs.launchpad.net/bugs/1910510

Title:
  [do-release-upgrade] An unresolvable problem occurred while
  calculating the upgrade.

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

Bug description:
  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again. 

  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 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-129.132-generic 4.15.18
  Uname: Linux 4.15.0-129-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia wl
  ApportVersion: 2.20.9-0ubuntu7.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jan  7 14:10:55 2021
  InstallationDate: Installed on 2017-07-04 (1282 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-01-07 (0 days ago)

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