[Bug 1924770] Re: unable to proceed to distribution upgrade from 16.04 to 18.04

[Sebastien Kramm]

Seems theses 2 files were not attached to automated bug report, so here
there are.

** Attachment added: "main.log"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1924770/+attachment/5488929/+files/main.log

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https://bugs.launchpad.net/bugs/1924770

Title:
  unable to proceed to distribution upgrade from 16.04 to 18.04

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

Bug description:
  With $ do-release-upgrade, I get: (after the check for packages
  online).

  [...]
  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

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

  And then I did:
  $ ubuntu-bug ubuntu-release-upgrader-core

  I assume the related files ('main.log' and 'apt.log') are included in
  this automated bug report?

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32
  ProcVersionSignature: Ubuntu 4.4.0-209.241-generic 4.4.262
  Uname: Linux 4.4.0-209-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.30
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Fri Apr 16 15:59:34 2021
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2021-04-16 (0 days ago)

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