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.
---
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
DistroRelease: Ubuntu 14.10
InstallationDate: Installed on 2012-05-06 (907 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423)
NonfreeKernelModules: nvidia
Package: ubuntu-release-upgrader (not installed)
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Tags: utopic dist-upgrade
Uname: Linux 3.16.0-24-generic x86_64
UpgradeStatus: Upgraded to utopic on 2014-10-28 (2 days ago)
UserGroups: adm cdrom dialout dip fuse kismet lpadmin monetdb netdev plugdev sambashare sudo uucp
_MarkForUpload: True
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:/