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

[JoyG]

Public bug reported:

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

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


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

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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:
  New

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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