[Bug 2021582] [NEW] Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade.

[Cora]

Public bug reported:

    Updating repository information 
Hit http://archive.ubuntu.com/ubuntu bionic InRelease 
Hit http://security.ubuntu.com/ubuntu bionic-security InRelease 
Hit http://archive.ubuntu.com/ubuntu bionic-updates InRelease 
Hit http://archive.ubuntu.com/ubuntu bionic-backports InRelease Fetched O B in 0s (0 B/s)

 Checking package manager 
Reading package lists... Done 
Building dependency tree 
Reading state information... Done
 
Calculating the changes 
Calculating the changes 
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'.
    Restoring original system state

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 08:36:11 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/2021582

Title:
  Could not calculate the upgrade An unresolvable problem occurred while
  calculating the upgrade.

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

Bug description:
      Updating repository information 
  Hit http://archive.ubuntu.com/ubuntu bionic InRelease 
  Hit http://security.ubuntu.com/ubuntu bionic-security InRelease 
  Hit http://archive.ubuntu.com/ubuntu bionic-updates InRelease 
  Hit http://archive.ubuntu.com/ubuntu bionic-backports InRelease Fetched O B in 0s (0 B/s)

   Checking package manager 
  Reading package lists... Done 
  Building dependency tree 
  Reading state information... Done
   
  Calculating the changes 
  Calculating the changes 
  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'.
      Restoring original system state

  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 08:36:11 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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