When I try to upgrade from Ubuntu Gnome 13.10 to Ubuntu 14.04, the upgrade application fails with the following message:
Could not calculate the upgrade. An unresolvable problem occurred while calculating the upgrade.`
Here is the complete log:
$ cat /etc/issue Ubuntu 13.10 \n \l $ sudo apt-get update $ sudo apt-get upgrade $ sudo do-release-upgrade 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 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 Aborting Reading package lists... Done Building dependency tree Reading state information... Done Building data structures... Done
Am I missing something? or it is just a bug?
I analyzed the log file and found that
do-release-upgrade is complaining about some obsolete packages.
$ cat /var/log/dist-upgrade/main.log | grep Obsolete 2014-04-28 09:16:23,678 DEBUG Obsolete: flashplugin-nonfree-extrasound:i386 (..)
After removing those packages, I was able to proceed with the upgrade.