[Bug 1805072] Re: “Unable to calculate upgrade” issue when upgrading from 18.04 to 18.10?

[Brian Murray]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a conflict between
packages from the official Ubuntu archive and packages from a PPA. To
resolve this situation please deactivate PPAs using the tool 'ppa-purge'
which is provided by the ppa-purge package. Then try performing the
release upgrade again. Thanks in advance!

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

** Tags added: ppa-conflict

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https://bugs.launchpad.net/bugs/1805072

Title:
  “Unable to calculate upgrade” issue when upgrading from 18.04 to
  18.10?

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

Bug description:
  I disabled all PPA but still error occured

  After removing xserver-xorg-* it can continue

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.28
  ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
  Uname: Linux 4.15.0-39-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Nov 26 09:23:10 2018
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2018-11-26 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2018-11-20T01:45:27.545628

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