[Bug 1893930] Re: I am unable to upgrade ubuntu 20.04, after sudo do-release-upgrade -d

[Klaus]

After first trying to upgrade with : do-release-upgrade -p  
the result was : 
An unresolvable problem occurred while calculating the upgrade. 

This was likely caused by: 
* Unofficial software packages not provided by Ubuntu 
 I then unticked all " PPA 's "
the result was :
Could not determine the upgrade 

An unresolvable problem occurred while calculating the upgrade.

Can't the upgrader indicate [ Which "Unofficial" software is a problem ?
]

My next option is to get a fourth hard drive installed on the PC and install 20.04.lts there.
[ I have drive 1 = Win XP , drive 2 = Win 7 , drive 3 = Ubuntu 18.04 LTS ]

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https://bugs.launchpad.net/bugs/1893930

Title:
  I am unable to upgrade ubuntu 20.04, after sudo do-release-upgrade -d

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

Bug description:
  system reports

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  I  have ubuntu 18.04 and did

  sudo apt update
  sudo apt upgrade
  but nothing helped

  Peter markos

  lsb_release -rd
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  apt-cache policy pkgname
  N: Unable to locate package pkgname

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-115.116-generic 4.15.18
  Uname: Linux 4.15.0-115-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Wed Sep  2 13:20:53 2020
  InstallationDate: Installed on 2014-12-11 (2092 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-02 (0 days ago)

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