[Bug 1386434] Re: Can't upgrade from trusty.

[Brian Murray]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. Please execute the following command, as it will
automatically gather debugging information, in a terminal:

  apport-collect 1386434

When reporting bugs in the future please use apport by using 'ubuntu-
bug' and the name of the package affected. You can learn more about this
functionality at https://wiki.ubuntu.com/ReportingBugs.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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

Title:
  Can't upgrade from trusty.

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

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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