I was trying to upgrade from ubuntu 14.04 LTS to 14.10 LTS and when I tried to do it via the GUI and from the terminal (apt-get update, apt-get upgrade, sudo do-release-upgrade) I get:
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.
Restoring original system state
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