[Bug 1923886] Re: An unresolvable problem occurred while calculating the upgrade.

[Saulius Bartkevicius]

do-release-upgrade -p
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1.554 B]                                         
Get:2 Upgrade tool [1.349 kB]                                                  
Fetched 1.350 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
Hit http://mirror.vpsnet.com/ubuntu bionic InRelease                           
Hit http://mirror.vpsnet.com/ubuntu bionic-updates InRelease                   
Hit http://mirror.vpsnet.com/ubuntu bionic-security InRelease                  
Hit http://mirror.vpsnet.com/ubuntu bionic-backports InRelease                 
Hit http://dl.google.com/linux/chrome/deb stable InRelease                     
Hit http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu bionic InRelease      
Hit http://ppa.launchpad.net/ondrej/php/ubuntu bionic InRelease                
Hit https://download.sublimetext.com apt/stable/ InRelease                     
Fetched 0 B in 0s (0 B/s)                                                      
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Checking for installed snaps

Calculating snap size requirements

Updating repository information

Third party sources disabled

Some third party entries in your sources.list were disabled. You can 
re-enable them after the upgrade with the 'software-properties' tool 
or your package manager. 

To continue please press [ENTER]

Hit http://mirror.vpsnet.com/ubuntu focal InRelease                            
Hit http://mirror.vpsnet.com/ubuntu focal-updates InRelease                    
Hit http://mirror.vpsnet.com/ubuntu focal-security InRelease                   
Hit http://mirror.vpsnet.com/ubuntu focal-backports InRelease                  
Fetched 0 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.

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'. 


Restoring original system state

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

-- 
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Ubuntu.
https://bugs.launchpad.net/bugs/1923886

Title:
  An unresolvable problem occurred while calculating the upgrade.

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

Bug description:
  An unresolvable problem occurred while calculating the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 5.4.0-71.79~18.04.1-generic 5.4.101
  Uname: Linux 5.4.0-71-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 14 21:34:20 2021
  InstallationDate: Installed on 2020-01-26 (444 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-14 (0 days ago)

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