[Bug 1840386] Re: impossible calculate upgrade of version

[Chris Guiver]

Hi Melissa

I'll firstly provide the following official wiki page
https://help.ubuntu.com/community/CleanUpgrade

The error message mentions the tool `ppa-purge` which is probably easiest if you read a support site like https://askubuntu.com/questions/307/how-can-ppas-be-removed, though other Ubuntu wiki pages have examples too -
- https://help.ubuntu.com/community/UbuntuStudio/BackportsPPA
- https://wiki.ubuntu.com/UbuntuGNOME/HowTo/UpgradeGnomeShell
You'll have to know the names of the PPAs you added; looking in your sources, or `history` can provide clues. 

If you need support, please have a look at
https://discourse.ubuntu.com/t/finding-help/712  (if this bug report is
converted into a question it'll convert to the last option in the list
on that page).

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https://bugs.launchpad.net/bugs/1840386

Title:
  impossible calculate upgrade of version

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

Bug description:
  
  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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.34
  ProcVersionSignature: Ubuntu 4.15.0-58.64-generic 4.15.18
  Uname: Linux 4.15.0-58-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Aug 15 20:26:17 2019
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  InstallationDate: Installed on 2018-08-07 (373 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2019-08-15 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2019-05-28T22:59:50.250963

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