[Bug 1898368] [NEW] I had a previous problem with some unofficial xorg ppa, I removed it using ppa-purge and tried to upgrade again but I only got the same result

[Jorge Caballero]

Public bug reported:

I had a previous problem with some unofficial xorg ppa, I removed it
using ppa-purge and tried to upgrade again but I got the same message:
"Could not calculate the upgrade

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  (...)"


Description:	Ubuntu 18.04.5 LTS
Release:	18.04

Software Center
I want to upgrade from 18.04 to 20.3 version, but i got This message: "An unresolvable problem occurred while calculating the upgrade."

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct  3 09:20:51 2020
InstallationDate: Installed on 2019-08-13 (416 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-03 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug bionic dist-upgrade

** Attachment added: "logs"
   https://bugs.launchpad.net/bugs/1898368/+attachment/5417111/+files/log.zip

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https://bugs.launchpad.net/bugs/1898368

Title:
  I had a previous problem with some unofficial xorg ppa, I removed it
  using ppa-purge and tried to upgrade again but I only got the same
  result

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

Bug description:
  I had a previous problem with some unofficial xorg ppa, I removed it
  using ppa-purge and tried to upgrade again but I got the same message:
  "Could not calculate the upgrade

  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  (...)"


  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  Software Center
  I want to upgrade from 18.04 to 20.3 version, but i got This message: "An unresolvable problem occurred while calculating the upgrade."

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Oct  3 09:20:51 2020
  InstallationDate: Installed on 2019-08-13 (416 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-03 (0 days ago)
  VarLogDistupgradeTermlog:

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