[Bug 1581232] [NEW] Unable to upgrade to ubuntu 16.04

[azure32]

Public bug reported:

After trying to upgrade to ubuntu 16.04 (from 15.10), I got the error
message that

"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 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

I did a sudo apt-get clean, update, dist-upgrade, etc.

I checked the log with $ grep ERROR /var/log/dist-upgrade/main.log : 
2016-05-12 15:00:56,655 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

However, $ sudo apt-get -f update does nothing to fix the problem, and
all other methods I could think of show that I have no broken packages.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 3.16.0-52.71~14.04.1-generic 3.16.7-ckt18
Uname: Linux 3.16.0-52-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Thu May 12 15:01:25 2016
InstallationDate: Installed on 2015-07-29 (288 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-05-12 (0 days ago)

** 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/1581232

Title:
  Unable to upgrade to ubuntu 16.04

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

Bug description:
  After trying to upgrade to ubuntu 16.04 (from 15.10), I got the error
  message that

  "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 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

  I did a sudo apt-get clean, update, dist-upgrade, etc.

  I checked the log with $ grep ERROR /var/log/dist-upgrade/main.log : 
  2016-05-12 15:00:56,655 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

  However, $ sudo apt-get -f update does nothing to fix the problem, and
  all other methods I could think of show that I have no broken
  packages.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 3.16.0-52.71~14.04.1-generic 3.16.7-ckt18
  Uname: Linux 3.16.0-52-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu May 12 15:01:25 2016
  InstallationDate: Installed on 2015-07-29 (288 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-05-12 (0 days ago)

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