[Bug 1889308] Re: An unresolvable problem occurred while calculating the upgrade. 18.04 to 20.04

[Kai Kasurinen]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

** This bug has been marked a duplicate of bug 1611737
   Can't upgrade from a release if ros packages are  installed from ROS servers

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https://bugs.launchpad.net/bugs/1889308

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:
  Cannot upgrade from 18.04 to 20.04 using the GUI upgrade method. It
  fails with "cannot calculate upgrade" and asks to "ppa-purge" to
  remove some packages.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
  Uname: Linux 4.15.0-112-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jul 29 01:45:30 2020
  InstallationDate: Installed on 2017-09-16 (1046 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-07-28 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-07-29T01:03:38.114606

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