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?
UPDATE:
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.