[Bug 2021574] [NEW] An unresolvable problem occurred while calculating the upgrade.

[Cora]

Public bug reported:

    An unresolvable problem occurred while calculating the upgrade.
If none of this applies, then please report this bug using thecommand ubuntu-bug ubuntu-release-upgrader-core' in a terminal.Iflyou 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'.

how to update the Ubuntu 16.04 LTS to Ubuntu 20.04.1

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.32
ProcVersionSignature: Ubuntu 4.4.0-210.242-generic 4.4.262
Uname: Linux 4.4.0-210-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.30
Architecture: amd64
CrashDB: ubuntu
Date: Tue May 30 08:13:52 2023
InstallationDate: Installed on 2018-10-17 (1685 days ago)
InstallationMedia: Ubuntu-Server 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2023-05-30 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/2021574

Title:
      An unresolvable problem occurred while calculating the upgrade.

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

Bug description:
      An unresolvable problem occurred while calculating the upgrade.
  If none of this applies, then please report this bug using thecommand ubuntu-bug ubuntu-release-upgrader-core' in a terminal.Iflyou 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'.

  how to update the Ubuntu 16.04 LTS to Ubuntu 20.04.1

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32
  ProcVersionSignature: Ubuntu 4.4.0-210.242-generic 4.4.262
  Uname: Linux 4.4.0-210-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.30
  Architecture: amd64
  CrashDB: ubuntu
  Date: Tue May 30 08:13:52 2023
  InstallationDate: Installed on 2018-10-17 (1685 days ago)
  InstallationMedia: Ubuntu-Server 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2023-05-30 (0 days ago)

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