[Bug 1740803] [NEW] upgrading caused this error

[sandk32 at hotmail.com]

Public bug reported:

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 17.04
Package: ubuntu-release-upgrader-core 1:17.04.10
ProcVersionSignature: Ubuntu 4.8.0-59.64-generic 4.8.17
Uname: Linux 4.8.0-59-generic i686
ApportVersion: 2.20.4-0ubuntu4.9
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Jan  1 17:51:39 2018
InstallationDate: Installed on 2017-02-14 (321 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release i386 (20161012.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to zesty on 2018-01-02 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: apport-bug dist-upgrade i386 third-party-packages zesty

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/1740803

Title:
  upgrading caused this error

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 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 17.04
  Package: ubuntu-release-upgrader-core 1:17.04.10
  ProcVersionSignature: Ubuntu 4.8.0-59.64-generic 4.8.17
  Uname: Linux 4.8.0-59-generic i686
  ApportVersion: 2.20.4-0ubuntu4.9
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Jan  1 17:51:39 2018
  InstallationDate: Installed on 2017-02-14 (321 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release i386 (20161012.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to zesty on 2018-01-02 (0 days ago)
  VarLogDistupgradeTermlog:

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1740803/+subscriptions