[Bug 2021551] Re: 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

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

** Tags added: third-party-packages

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https://bugs.launchpad.net/bugs/2021551

Title:
  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

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

Bug description:
  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 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 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32
  ProcVersionSignature: Ubuntu 4.4.0-210.242-generic 4.4.262
  Uname: Linux 4.4.0-210-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.30
  Architecture: amd64
  CrashDB: ubuntu
  Date: Tue May 30 03:26:49 2023
  InstallationDate: Installed on 2018-10-17 (1685 days ago)
  InstallationMedia: Ubuntu-Server 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2023-05-30 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2023-05-30T02:28:39.353402

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