[Bug 1769608] [NEW] i was upgrading from ubuntu 17.1 to 18, one machine was upgraded, but another (this) machine is not upgrading

[Harcharan Singh]

*** This bug is a duplicate of bug 1768620 ***
    https://bugs.launchpad.net/bugs/1768620

Public bug reported:

i was upgrading from ubuntu 17.10 to 18, one machine was upgraded
successfully, but another (this) machine is not upgrading it says: Could
not calculate the upgrade:

An unresolvable problem occurred while calculating the upgrade.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-release-upgrader-core 1:17.10.11
ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
Uname: Linux 4.13.0-39-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.8
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon May  7 15:10:37 2018
InstallationDate: Installed on 2018-03-16 (52 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to artful on 2018-05-07 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug artful dist-upgrade third-party-packages wayland-session

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https://bugs.launchpad.net/bugs/1769608

Title:
  i was upgrading from ubuntu 17.1 to 18, one machine was upgraded, but
  another (this) machine is not upgrading

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

Bug description:
  i was upgrading from ubuntu 17.10 to 18, one machine was upgraded
  successfully, but another (this) machine is not upgrading it says:
  Could not calculate the upgrade:

  An unresolvable problem occurred while calculating the upgrade.

   This can be caused by:
   * Upgrading to a pre-release version of Ubuntu
   * Running the current pre-release version of Ubuntu
   * Unofficial software packages not provided by Ubuntu

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
  Uname: Linux 4.13.0-39-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May  7 15:10:37 2018
  InstallationDate: Installed on 2018-03-16 (52 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-05-07 (0 days ago)
  VarLogDistupgradeTermlog:

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