[Bug 1907920] [NEW] An unresolvable problem occurred while calculating the upgrade

[Teunis Peters]

Public bug reported:

This advice is bad.  Because this release just got purged from sites,
this is no longer possible to do:

* 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.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubuntu-release-upgrader-core 1:19.10.15.4 [origin: unknown]
ProcVersionSignature: Ubuntu 5.3.0-64.58-generic 5.3.18
Uname: Linux 5.3.0-64-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.9
Architecture: amd64
CrashDB: ubuntu
Date: Sat Dec 12 16:15:41 2020
InstallationDate: Installed on 2018-03-09 (1009 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en_US
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to eoan on 2020-12-12 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade eoan third-party-packages

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https://bugs.launchpad.net/bugs/1907920

Title:
  An unresolvable problem occurred while calculating the upgrade

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

Bug description:
  This advice is bad.  Because this release just got purged from sites,
  this is no longer possible to do:

  * 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.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15.4 [origin: unknown]
  ProcVersionSignature: Ubuntu 5.3.0-64.58-generic 5.3.18
  Uname: Linux 5.3.0-64-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.9
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Dec 12 16:15:41 2020
  InstallationDate: Installed on 2018-03-09 (1009 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to eoan on 2020-12-12 (0 days ago)

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