[Bug 1895583] [NEW] upgrade script show "unresolvable problem while calculating upgrade"

[TSandman]

Public bug reported:

Description:	Ubuntu 18.04.5 LTS
Release:	18.04

Got the following when trying to upgrade to 20.04 LTS


>sudo do-release-upgrade -d

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]                                                                                                                                                        
Get:2 Upgrade tool [1,342 kB]                                                                                                                                                                 
Fetched 1,344 kB in 0s (0 B/s)                                                                                                                                                                
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
extracting 'focal.tar.gz'

Reading cache

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.

This was caused by: 
* Upgrading to a pre-release version of Ubuntu 
This is most likely a transient problem, 
please try again later. 
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

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

==========================


Couldn't really undestand what's in /var/log/dist-upgrade/main.log or apt.log


I tried removing every non-ubuntu repositories but I get the same things

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
Uname: Linux 5.7.1-050701-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
Date: Mon Sep 14 16:09:49 2020
InstallationDate: Installed on 2019-12-02 (287 days ago)
InstallationMedia: Xubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-14 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/1895583

Title:
  upgrade script show "unresolvable problem while calculating upgrade"

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

Bug description:
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  Got the following when trying to upgrade to 20.04 LTS

  
  >sudo do-release-upgrade -d

  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [1,554 B]                                                                                                                                                        
  Get:2 Upgrade tool [1,342 kB]                                                                                                                                                                 
  Fetched 1,344 kB in 0s (0 B/s)                                                                                                                                                                
  authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
  extracting 'focal.tar.gz'

  Reading cache

  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.

  This was caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  This is most likely a transient problem, 
  please try again later. 
  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

  Aborting
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  ==========================

  
  Couldn't really undestand what's in /var/log/dist-upgrade/main.log or apt.log


  I tried removing every non-ubuntu repositories but I get the same
  things

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  Uname: Linux 5.7.1-050701-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Sep 14 16:09:49 2020
  InstallationDate: Installed on 2019-12-02 (287 days ago)
  InstallationMedia: Xubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-14 (0 days ago)

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