[Bug 1883847] Re: Upgrade from 18.04 to 20.04 failed

[Damien Cooke]

This was resolved by removing Mono from my system

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https://bugs.launchpad.net/bugs/1883847

Title:
  Upgrade from 18.04 to 20.04 failed

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

Bug description:
  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

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37 [origin: unknown]
  ProcVersionSignature: Ubuntu 4.15.0-106.107-generic 4.15.18
  Uname: Linux 4.15.0-106-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: X-Cinnamon
  Date: Wed Jun 17 17:02:09 2020
  InstallationDate: Installed on 2016-12-09 (1285 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-06-17 (0 days ago)

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