Hi,
I'm trying to upgrade from 13.10 to 14.04 and got this after running sudo do-release-upgrade:
---8<---
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
Calculating the changes
Calculating the changes
Could not determine 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
---8<---
The last 'Unofficial packages not provided by Ubuntu' may very well apply, but how do I determine this, so I can (hopefully) remove them?
Thanks,
Frans
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