[Bug 1386434] [NEW] Can't upgrade from trusty.

[ErikBerglund]

Public bug reported:

After running: 
sudo do-release-upgrade

the upgrade stops with the message:
>Calculating the changes

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. 

>

In addition, the bug reporting tool also crashes.

None of the suggested causes apply. No further information is available.

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

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https://bugs.launchpad.net/bugs/1386434

Title:
  Can't upgrade from trusty.

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

Bug description:
  After running: 
  sudo do-release-upgrade

  the upgrade stops with the message:
  >Calculating the changes

  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. 

  >

  In addition, the bug reporting tool also crashes.

  None of the suggested causes apply. No further information is
  available.

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