[Bug 1578560] [NEW] Offered upgrade fails every time "could not calculate upgrade"

[TenLeftFingers]

Public bug reported:

Running $ grep ERROR /var/log/dist-upgrade/main.log
shows

2016-05-05 10:23:56,869 ERROR Dist-upgrade failed: 'E:Unable to correct
problems, you have held broken packages.'

Running synaptic shows no entries under the 'broken' tab.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Thu May  5 10:38:17 2016
InstallationDate: Installed on 2016-02-05 (89 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-05-05 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1578560

Title:
  Offered upgrade fails every time "could not calculate upgrade"

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

Bug description:
  Running $ grep ERROR /var/log/dist-upgrade/main.log
  shows

  2016-05-05 10:23:56,869 ERROR Dist-upgrade failed: 'E:Unable to
  correct problems, you have held broken packages.'

  Running synaptic shows no entries under the 'broken' tab.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu May  5 10:38:17 2016
  InstallationDate: Installed on 2016-02-05 (89 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-05-05 (0 days ago)
  VarLogDistupgradeTermlog:

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