Public bug reported: I'm following the instructions given during the failing upgrade process:
... 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. Current release: Description: Ubuntu 14.04.5 LTS Release: 14.04 ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: ubuntu-release-upgrader-core 1:0.220.9 ProcVersionSignature: Ubuntu 3.13.0-105.152-generic 3.13.11-ckt39 Uname: Linux 3.13.0-105-generic i686 NonfreeKernelModules: openafs ApportVersion: 2.14.1-0ubuntu3.23 Architecture: i386 CrashDB: ubuntu CurrentDesktop: Unity Date: Sun Dec 18 19:27:59 2016 InstallationDate: Installed on 2010-03-20 (2465 days ago) InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to trusty on 2016-12-18 (0 days ago) VarLogDistupgradeAptlog: Log time: 2016-12-18 19:28:05.458128 ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug dist-upgrade i386 trusty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1650931 Title: Trying to upgrade from 14.04 LTS to 16.04 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1650931/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs