[Bug 1655730] [NEW] cannot upgrade from 14.04 to 16.04

[Nicholas]

Public bug reported:

if I try to use the software updater or the terminal to upgrade, I get this message: 
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. 

If i search for broken packages, I get 700 entries. What should I do?

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.9
ProcVersionSignature: Ubuntu 3.16.0-77.99~14.04.1-generic 3.16.7-ckt27
Uname: Linux 3.16.0-77-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Jan 11 12:08:02 2017
InstallationDate: Installed on 2015-07-30 (531 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2017-01-11 (0 days ago)
mtime.conffile..etc.update.manager.release.upgrades: 2017-01-11T11:10:28.610782

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


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

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https://bugs.launchpad.net/bugs/1655730

Title:
  cannot upgrade from 14.04 to 16.04

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

Bug description:
  if I try to use the software updater or the terminal to upgrade, I get this message: 
  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. 

  If i search for broken packages, I get 700 entries. What should I do?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.9
  ProcVersionSignature: Ubuntu 3.16.0-77.99~14.04.1-generic 3.16.7-ckt27
  Uname: Linux 3.16.0-77-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Jan 11 12:08:02 2017
  InstallationDate: Installed on 2015-07-30 (531 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2017-01-11 (0 days ago)
  mtime.conffile..etc.update.manager.release.upgrades: 2017-01-11T11:10:28.610782

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